On the help part, it exactly says as you're guessing: Helping somebody win will net you no rewards, and the battle deck is a different deck from your profile 5-card list. The note there is warning you that the card selected for help will be the main one in your deck, not in your profile.

The trap advice is the following:

Decks in PeroColliseum are usually decks of Moe 5 and Moe 4/Sexy 1, given the percentile winning probability.
I will say that the most victorious defence deck is a daring Moe 3/Sexy 2 and the trap deck.
But this happens to be a very unsuitable deck for attack, becoming very troublesome because it's necessary to change decks every time between attack and defense times.
That's why most of the trap decks just wait until they are attacked, and then arbitrarily decide to counterattack.
Try to set your attack decks with the understanding that there will be such decks in play.

Thanks, updated it to reflect that.

I'm probably not the best one to be writing these considering I can't even read it without google backing me up.

Now, for a quick explanation on the winning prob of those two decks, it's basically based on the low time cost needed to build one.

If you didn't find out yet, SED curves for cards follow a simple set of rules:
SED gain per level for Moe cards decreases as you approach top level.
SED gain per level for Babe cards remains relatively the same for every level (it might fluctuate, raise or drop a bit)
SED gain per level for Sexy cards increases as you approach top level.

What this translates to is that Moe cards can reach 60% of their top SED around Lvl40, while Sexy cards don't reach that amount before Lvl80, and Babe cards achieve that around Lvl60. Of course, almost all Sexy cards have at least 10% more top SED than any Moe of the same rarity.

Crossing that with the fact that matchup bonus means a card of any attribute can defeat a card of the weaker attribute being just one third as powerful, this means that:
Matching SR vs SR, a Lvl20 SR Moe will most probably win against a Lvl100 SR Sexy. Similarly, a Lvl45 SR Sexy will always defeat a Lvl100 SR Babe; and a Lvl30 SR Babe will always defeat a Lvl100 SR Moe.
Even more! Matching your R vs an SR, you only need a Lvl40 R Moe to defeat any Lvl100 SR Sexy. Once again, values for Sexy and Babe are higher (around Lvl70 and Lvl50, respectively).

What this means is that players that aren't in the top percentile, or don't want to throw too much (or any) money into the game, can easily make a colliseum-winning deck just by rasing 5 R Moes to Lvl40~50, and/or a couple SR Moes to Lvl20~30; and then targetting Sexy predominant decks. That's actually buildable in a few weeks (It took me about two weeks to top level 2 SR cards, just from daily rewards, gacha/chances, and other miscelaneous rewards...).

- - - Updated - - -

Originally Posted by Kotono

Thanks, updated it to reflect that.

I'm probably not the best one to be writing these considering I can't even read it without google backing me up.

No problem. My ability with the JP language is not that far from yours. I just have enough experience to keep my trusty EN-JP dictionary at hand, and then double-check anything that seems too spotty from the google translation and try to fix it.
I could do a full translation, but it would take too much time and effort, so that first Google pass through the text saves a lot of worktime

- - - Updated - - -

I'll add here what I posted near the end of the thread for Event 1, regarding the Colliseum:

Currently best cards are:

->Open Spoiler<-

• Super Rare
  
  • Event-Only:
    
    • Chikusa Uno (12,700)
    • Miyu Kisaki (11,830)
  • F2P:
    
    • Hiyori Katagiri (11,000)
• Rare
  
  • F2P:
    
    • Marie Mochizuki (7,270)
    • Airu Shirayuki (7,080)
    • Noriko Takase (6,410)
• Normal
  
  • F2P:
    
    • Riza Shimozono (2,860)
    • Ouka Komai (2,700)
    • Shuri Kanno (2,370)

The values posted in the wiki state the matchup bonus is 3x...
That actually means a lvl maxed card can easily defeat any matchup lvl maxed card one rarity tier up, and any lvl maxed normal can defeat any matchup lvl50~60 SR card.

That's a huge advantage given to matchups.

Currently, minimum requirements for having any chance are:

->Open Spoiler<-

• Against all Super Rare deck
  
  • Lvl100:
    
    • 3,944: No N card. Any midleveled R. Any lowleveled SR card
    • 3,667: No N card. Any midleveled R or SR card
    • 4,234: No N card. Any midleveled R or SR card
  • Lvl75:
    
    • 2,958: No N card. Any midleveled R or SR card
    • 2,750: Lvl90 Riza Shimozono. Any midleveled R or SR card
    • 3,175: No N card. Any midleveled R or SR card
  • Lvl50:
    
    • 1,972: Any high leveled N card. Any midleveled R card. Any low leveled SR card
    • 1,834: Any high leveled N card. Any midleveled R card. Any low leveled SR card
    • 2,117: Any high leveled N card. Any midleveled R card. Any low leveled SR card
• Against all Rare deck
  
  • Any N matchup card will work for evenly matched lvls.
  • Any R/SR matchup card will work, regardless of lvl.
• Against all Normal deck
  
  • Any matchup card will work, regardless of lvl.

My SED tables are quite full of holes, so I can't calculate exact thresholds for R mid+ levels, or most SRs.

- - - Updated - - -

OK, from the people that played the JP card, HELP works the following way:

->Open Spoiler<-

Every time you attack another player, a random PeroFriend is selected, and their center card given to you as a Helper Card.
The first of your cards that is knocked out gets replaced by the Helper Card (same for your opponent).

An interesting tip somebody gave is that you can cancel an attack (The process is something like Enter List of Opponent -> Choose Oponent -> Start Battle) and reselect the opponent to get assigned a new helper card, until they're both useful to you.

Here players can check girl power of all girls in English version at level 100.

List of Super Rare Cards - PeroPero Seduction Wikia

So much great info. Thanks for all the hard work Kotono. ♥

Ugh, an RPS style of PvP?...I may be somewhat obsessed with trying to get every card there is in the game but I don't do RPS style anything...I don't even...just...yeah...

Not that it has any particular bearing on the ability to understand, but in your "Win Reward and Criteria" section, "Total Hypnotic Force of Opponent" probably means "Opponent SED". Can't provide much of a basis for it but if you remember that magic circle-like thing that pops up from time to time in the game when you do stuff like level up cards, use wild cards, or when the game loads, it's a triangular magic circle where the points are labeled "Seduction Skill" and the connecting circular bars read "Peropero Saimin", Saimin meaning hypnosis.

Just something to consider.

Yes, hypnotic force is referring to SED. I usually change it when I see it, but that is how it comes out when google is translating the wiki page for me.

Hey, at least the translator somewhat gets it right. In the aigis wiki it translates attack range as cum degree

Originally Posted by Kotono

Yes, hypnotic force is referring to SED. I usually change it when I see it, but that is how it comes out when google is translating the wiki page for me.

The term in JP is literally Saimin Power, which translates to Hypnotic Power. We're the ones using a different term (Seduction Power)