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If I may relate a story. Way back when I started making up pokemon (it's been 15 years, hasn't it) I had an idea for a pokemon that had two forms depending on where it was. On land, it was a ground type called Grumble. On the water, it was a Water type called Mermur. It looked something like a mudskipper, as that's where I got the idea from. (This was before Mudkip and Quagsire)
Anyway, I said that story so I can say this idea that was inspired by all your ideas, as well.

What if Schimre changed forms depending on his location?
Snake- (Dragon/ Poison) in the water he has a long serpentine form, ample for swimming. his speed is hightened in this form
Goat- (Dragon/ Rock) in the mountains/ caves he has cloven feet and horns for leaping from cliff to cliff and goring rock to make caves. his defense is hightened in this form
Lion- (Dragon/ Fire) on land, forest, and city areas he becomes takes on a bestial form that allows him to strike quickly and strike hard. increase in attack.

So the form would be dependant on terrain, leaving his defalt as the lion for arena battles, but that does not neccessarily limit him to that form in the arena. Moves like Surph that flood the battle field could trigger his snake form. Or rock slide could force his goat form. He could even have a move that allows him to shift forms giving him the advantage in different situations.