something that's helped me a lot more than i'd expected it to:
(Tier: UU)
Blastoise @ Blastoisinite
Ability: Rain Dish
EVs: 240 HP / 236 Def / 32 Spe
Bold Nature
IVs: 0 Atk
- Scald
- Rapid Spin
- Toxic
- Roar
basically, i needed a spinner/defogger and something that worked well enough as a physical wall, and finding the right mon at that time was being a pain in the ass, because i simply refuse to use donphan, tentacruel and empoleon, since i hate them for no proper reason, and other mons such as gligar and crobat just didnt fit too well into the team, at the time. soon enough, i realized my mega slot was still empty and how good of a type water can be when it comes to physical walling.
scald is pretty obvious: stab and the very useful 30% chance to burn. rapid spin is there to get rid of entry hazards, which are extremely common in uu. toxic helps m-blastoise deal with a wide variety of specially defensive mons and things it cant touch or catching something on a switch. i went with roar on the last slot because there are plenty of things that can set up on it behind a sub, which is very undesirable.
the only type of support this set requires is cleric. umbreon and florges work especially well as not only do they fulfill said role, but they can also form a pretty decent physically/specially defensive core with m-blastoise. entry hazard setters such as nidoqueen can also be pretty good, since m-blastoise has roar and residual damage is always nice. also, if you're aiming to build a stall team with this set, id recommend throwing a scarfer in there (i.e. mienshao) to clean up late-game, once your opponent's team has been weakened.