Seriously, level your rarest girls and the ones you like the most. I started playing on DMM and i clear most maps easily despite only having one girl at evolved level 70. To my knowledge there is no gold girl that is worse than any silver. There is one silver that is a must to have if you can get her though - Lilac, because of her passive that lets you pass through webs.

(In fact I am currently playing with Mint 2* (Evolved and Maxed) to farm Tickets for her. I have also many 3* Girls Evolved (Level 60), with 4 Equipment slots they are not really weaker than a 4* with only 1 or 2 Equipment slots, they helped me a lot and don't regret the investment, especially if you lack of a specific Archetype (like me in the beginning with zero 4+* Pierce).

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What the 2/3*s lack in raw stats and skills they at least partially make up for in easily unlocked equip slots, lower costs to evolve (both coins and using lower tier dragons so fewer runs through the 80 stamina dragon maps) and more easily leveled skills. While they will eventually be replaced, they're not a bad investment per se early on.

Personally, if you're going to evolve 2/3*s, I highly recommend giving priority to the ones with high speed, since this is the one stat a 2* can beat a 6* in, and some maps have some wacky speed gap requirements to 3-medal them. After speed comes type (if you're lacking a specific one).

tfw your 2* waifu is slower than Lavender or Cosmos

Anchors are as useful, actually. To slow down that sanik teams with Alpina, Orchid Wylder and Edelveiss evolved XD

Kinda works opposite for me. I'm using Oncidium so Strawberry and Lavender aren't lagging behind like crazy (Canola and Dendrobium balance the team out).

Originally Posted by ZeroZet

Anchors are as useful, actually. To slow down that sanik teams with Alpina, Orchid Wylder and Edelveiss evolved XD

Well, that's taking my point from the other end lol. Ultimately, depends on if your 4+*s are fast or slow. The three you listed combined can make for a VERY fast team (which on some maps end up being the boss and ending map too soon and you miss some pests).

TLDR: If you're going to raise 2/3*s seriously, focus on ones with extremely high or low speed and use them to balance/unbalance your 4+* teams' speeds to make sure u hit all pests on map.

I started playing this right when the Moonvine event begun, that's around 52 days ago and i upgraded the 2* girls, i already have maxed out all of them and i can say the investment was worthy, they allow me to clear Ultimate maps, i can't say with ease but with some planning and strategy i have cleared many Ultimate maps with 3 stars

I'm currently working on the Copper units and i'm planning to max out all of them too, i will recomend to lv up your girls equally, if you concentrate all your efforts on a few of them you will eventually run into a situation where the enemies are to many and stronger than your squads, it's better to have squads with all the members at lv 40+ than a squad with 1 single unit of lv 50+ and the rest with lv 20-30, also try to keep all your squads with similar speeds, when you need one or two speedy squads you can switch girls form squad to squad to get the speed you need for a certain map

Here's my Squads:

I keep Di Yu because she was my first unit and had max affection from the start and those affection bonuses helps her a lot even when she is just lv 31, she will stay in the squad until i max out another Copper girl, i'm not saying Silver or Gold girls aren't that great, they are awesome, specially with their powerfull skills which gives stats boost, but if you don't have to many of them you shouldn't be afraid to invest on the lower rarity girls, they can fight too