Perhaps Slowpoke/Slowbro/Slowking would be a little more accurate.
You’ve seen me before
Coming back for more
While this evolution line originated in RBY, it gained an extra link in the chain later (Slowking), thereby "coming back for more."
When the going gets rough
I’m not always tough
Slowpoke's defenses aren't great, and depending on its evolution it has difficulty dealing with either Physical attacks (Slowking) or Special attacks (Slowbro).
It’s a double-edged sword
I’m usually bored
Slowpoke is dopey, but that grants it a natural resistance against pain. It can only become stronger if it is bitten my a Shellder - being bitten is usually considered a bad thing.
You may think it’s wrong
But I never stay for long
These Pokemon aren't often used on competitive battling teams; while Slowbro was a viable option in RBY, none of these Pokemon are often used in the modern games. As a result, they don't "stay for long" in tournaments because they gets KOed quickly they are even used at all.
So let’s get to it!
I’ve got a sharp wit
These Pokemon have plenty of mental potential that can be unleashed, as it is when Slowpoke evolves into Slowking.
Anywhere we go is fine with me
As long as I can assure my safety
Slowpoke and Slowbro are fairly dim-witted and therefore don't care where they are. But if Slowbro and Slowking lose their attached Shellders during a harsh battle, they revert to being regular Slowpokes according to various Pokedexes.. Therefore, they would prefer to assure their own safety. Slowpoke would likely also wish to avoid being attacked.