Originally Posted by Drip

Excerpt from the Flower Knight Girl For Dummies manual:
1. Slice girls shouldn't pick Slice mobs but show a strong preference to kill Pierce mobs instead. Similarly, Pierce girls should go after hit-mobs, Hit-girls after magic-mobs and magical girls should always hit on the slice beasties!
2. Save your special attacks for last, especially if your special attack deals damage to multiple enemies at once, then it's preferable to wait until there's only one mob left standing with only the tiniest sliver of health, to then hit it with your special attack for increased dramatic effect!

I believe you forgot one more:
- Be mindful of your squad's safety, use alternate paths to avoid enemy pests and minimise damage where possible!