Empoleon and Roserade

Man, the memories.
I remember having these two on my team in Pearl, Piplup being my starter and having caught my Roserade from a Budew outside of Jubilife City after being on the bad side of the Poison Point ability and realizing I needed to have it, and the two of them were miles above the rest of the group in terms of levels (albeit, because I didn't know how to get Roselia to become a Roserade until later, so I literally level-grinded her to the late 50's and early 60's before giving up and Googling it (my Empoleon, naturally, leveling up alongside her), all before taking on Cyrus).
Except for Cynthia's Garchomp, they were unstoppable together.
Definitely my most nostalgic pokemon bundled together.