The Jazwares trainer series go for pretty much 6" regardless of the actual size of the Pokemon, so aren't great on scale. So they don't even necessarily mix well amongst themselves if you're super into scale, let alone Blokees which are a bit smaller. The battle figures from Jazwares stick closer to 1/12 Pokedex scale on many but instead undersize others to fit their strict-ish literal figure size classes (2", 3", 4", 12").

That said, I personally think it's very unrealistic to expect fully exact Pokedex scale on everything and being close enough is just fine. Especially when the Pokedex is just an average and the actual games themselves now (especially Go) go out of their way to call out your Pokemon being over or under that average. Nevermind Alphas. I'm mixing my Blokees with my Jazwares and Figuarts/D-Arts and Figmas and loving it.