It's effectively a Pokemon that "re-evolves" at the start of each battle after reaching a certain level. I imagine it gets good stats, but a real evolution would get improved stats + an ability for extra benefit, so I'm worried this might be a net loss.I'm guessing the fish gets real good stats in exchange for its ability to access that form
I love the concept, though. From a creative standpoint, it's brilliant. I just question if it's for the best in terms of competitive potential.