@Foulcat

I have some advice:

What attacks does your trofinch have? I don't accurately remember the type of moves that are compatible with a trofinch, but try getting this attack scroll for your pixpet: Crowning ceremony (use this on your first move).

Don't use peck. It's a useless attack. Stamina is really easily gained so peck does nothing.

Also have atleast 15 health gaining potions and stamina gaining ones as well. This is the toughest battle in pixpet adventure so you'll have to equip yourself well!

Get a battle move that has strength of 100-120% for your pixpet, but make sure the accuracy isnt lower than 85%. Luputrix know outrun, which drastically decreases your accuracy.