Shell Bell Tank Slowbro - Primesss
Harness the blue bar to become invincible
Build Path

Water GunFirst Pick
Damage. Slow.

Surf
Damage. Displacement. Slow.

Amnesia
Forgets some pending damage. Defense up. Spellproof. Empowers Scald and Surf. (+)Increased Sp. Atk.

SlowbeamUNITE
Shield. Spellproof. Stun. Damage.
Stat Boosts
Special Move Vamp
Shield (Upon Unite)
Guide
Using the spam power already available to slowbro plus the amnesia ability to tank Lucario’s op abilities makes for a slightly viable pick over blastoise.
Amnesia is underutilized due to the fact it shares the same slot as TK, but Amnesia is slightly less buggy than TK so there is some potential in the move. Amnesia is currently bugged to only work when you are standing still so keep that in mind.
Despite the emphasis of the devs for Amnesia to be a dps boosting move, it actually is just Slack Off+. Amnesia Surf is a move than can actually bring some mons to half health, which allows for your team to bring teamfight wins closer.
Works Well With
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