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I'm gonna go with Terapagos here. Its stellar form gives it an over-the-top boost in stats and its Tera Starstorm move would probably make Ogerpon think twice before terastalizing (Kind of OP if you ask me).
Marshadow vs Decidueye?
Charizard. Its stats are fairly balanced while Magmortar's mainly favor attack.
Both could learn Ground type moves but Charizard's Flying type makes all the difference!
Falinks vs Metagross?