>>46509128It's not that they're inherently better than other Pokemon. Different Pokemon serve different roles. The roles that Incineroar and Landorus serve is an extremely important one.
Incineroar's Intimidate, Fake-Out, Snarl, Knock-Off, Taunt, U-Turn, and now Parting Shot let it act as an excellent support mon. It's not powerful itself, but it helps other Pokemon perform better.
Landorus is similar. It also has a lot of good support stuff, but it does a bit of everything. It's not the best at anything, but it can fill multiple roles on a team. If you need a ground immunity, electric immunity, intimidator, hazard setter, hazard remover, wall breaker, offensive pivot, defensive pivot, knock off user, speed control, suicide lead, etc., Lando can be any of those things, and often times multiple in one set. Being able to do all of these things doesn't invalidate other mons. It lets more mons shine because you don't need to squeeze all of these roles on your team.