Trainer Trials brainstorm - Pokémon with no special effects

First and foremost, we could have a trial for Pokémon with no Abilities only.

But then i wonder if the game can add extra mechanics to buff those "filler" Pokémon that even in those Trials probably won't be used. I mean Pokémon with no abilities and whose attacks don't have any effect (not even a coin toss for more damage or a underwhelming self heal). You know, stuff like Whimsicott PAF or Dugtrio MEW.

The easy solution by limiting to them only (like the "no Abilities only" I mentioned before) wouldn't be interesting enough. So I thought something like: when a player knocks out a filler Pokémon, they can either turn a face-down prize to face-up or pick a face-up prize card (effectively making them only half-prize worthy).

Of course there are many other kinds of mechanics, some simpler like drawing cards when evolving to a filler Pokémon - which I don't think so interesting but could work as well. Anyone else have more ideas?