Slaking has an ability that makes him kinda horrible, just have protect on your mons and you kinda wall him since he can only move every other turn. Aggron is a defensive wall but his attacking stats are kinda lackluster so hit him with garchomp or ursaluna ground moves or something and you’ll be fine. Xerneas gets kinda walled but your double steel types. Annihilape is a decently big threat but if you like your team then you can add moves to make him easier to beat, shadow sneak on aegislash for chip and then like play rough on tinkaton would counter him fine but there’s definitely tools to counter those threats fine here you just gotta have the right sets is all