Pokemon: Liepard
Role(s): Physical Wallbreaker
Type:
Abilities: Limber / Unburden /
Prankster
Stat Distribution: 55 / 115 / 60 / 50 / 60 / 110 (BST: 450)
Movepool Additions: Mach Punch, Superpower, Brick Break, Topsy-Turvy
Movepool Removals: —
Custom Elements: —
Justification: Priority spammer, with Fake Out and Mach Punch. It can break through Nihilego, and can easily revenge kill Raichu. It also has some utility options within U-turn, Taunt and Topsy-Turvy (with prankster). I guess you could also do an unburden set with grassy seed.
Pokemon: Landorus
Role(s): Wallbreaker
Type:
Abilities: Unnerve /
Aerilate
Stat Distribution: 70 / 97 / 90 / 118 / 70 / 70 (BST: 515)
Movepool Additions: Hyper Voice, Taunt
Movepool Removals: Hammer Arm, Outrage, Brick Break, U-turn, Superpower, Focus Blast
Custom Elements: —
Justification: Really powerful mixed wallbreaker with a lot of special coverage. It obliterates Meganium and Tapu Bulu and it can work its way against Cofagrigus, but it's hard-countered by Levitate Nihilego. 118 Spa/97 Atk + Aerilate is something you can't really laugh at, but its 70 speed makes it really easy to be revenge killed by raichu or even full SpA Flygon.
Pokemon: Mamoswine
Role(s): Wall, Hail Setter,
Type:
Abilities: Boulder-Basher* / Snow Warning /
Poison Heal
Stat Distribution: 120 / 75 / 80 / 75 / 90 / 40 (BST: 480)
Movepool Additions: Aurora Veil, Slack Off, Head Smash
Movepool Removals: —
Custom Elements: Boulder-Basher — Thick Fat clone for Rock and Steel
Justification: How can you make a rock/ice pokemon with 480 base stats viable? Give it 3 OP abilities! With those new tools, Mamoswine can run an big variety of different sets. It can pose Aurora Veil, it can go for a Poiso Healn/Substitute Stall set, and it could also go offensive, maybe even under trick room. Overall a pretty strong pokemon, but yeah, it's still rock/ice.
Pokemon: Flaaffy (Eviolite combatible)
Roles: Defensive Pivot, Cleric
Type:
Abilities: Natural Cure / Static /
Volt Absorb
Stat Distribution: 100 / 55 / 80 / 70 / 70 / 40 (BST: 395)
Movepool Additions: Dazzling Gleam, Wish, Heal Bell, Earth Power, Moonlight
Movepool Removals: —
Custom Elements: —
Justification: Electric/Fairy is a typing that I found really interesting for a defensive pivot. It has only two weaknesses and a great number of interesting resistances (and even one immunity!). Unfortunately, in normal play, all fairy/electric mons are either offensive (Koko) or not viable in most metagames (Dedenne). I decided to merge this interesting typing with another underrepresented concept, an eviolite user. And from this union is born Flaaffy! With great supportive movepool with Thunder Wave, Volt Switch and some new things like Wish and Heal Bell, Flaaffy could work as a really potent pivot. Its abilities even furter reinforce this role: Natural Cure adds more value to switching out and Volt Absorb gives it more switch-in opportunities. Flaaffy is still far from invinvible, since it would be pretty much walled by Nihilego, but it would be an interesting addition to the cast.
Just to mention, I inverted its defense and its special defense, so it could tank more from Liepard.