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One anon speculated that Venusaur and Blastoise's G-Max Moves will be based off the effects of the Pledge moves. G-Max Wildfire deals damage to opponents based on 1/6 of their max health, similar to the combined Fire+Grass Pledge effect. Not sure if that's an actual pattern or just coincidence.
For flavor I want Blastoise to have a sprinkler-themed G-Max Move that removes hazards from your side of the field, it seems like something that could actually make use of the many cannons on its shell.