Gigantamax Venusaur

Did you happen to notice that Attack stat? Yeah, Venusaur has never been a powerful damage-dealer on paper, and has always been boosted by Frenzy Plant as a means to boost its numbers. And while Gigantamax Venusaur doesn't really rely on Frenzy Plant, access to G-Max Vine Lash and a 0.5 second Fast Move in Vine Whip puts it head-and-shoulders above the majority of the competition in Dynamax battles. It's fallen off as an attacker in the presence of Gigantamax Rillaboom, but it still can do a lot of damage and can tank well. While its bulk is fairly on-par with Rillaboom, its Poison sub-typing gives it defensive niches, and it can pull duty as a tank or attacker pretty well.