Snorlax and Munchlax
I remember when Snorlax was one of the most common choices for a favorite pokemon, and I feel like it still represents a sort of simple fun the series has left behind. Snorlax is one of the easiest pokemon to draw next to Ditto or Voltorb, there's little more to its concept beyond a big, fat monster that sleeps all the time, and it doesn't even have a real animal basis. If anything, it's a pokemon-world equivalent to a giant panda without actually being a giant panda, which is something I wish Pokemon still did more often. I miss these all-original monsters.
Snorlax is also the last pokemon of the original 151 to have gotten a "baby" stage, and Munchlax is fairly cute, actually maybe even a little cuter. I really like the way the upper half of its head looks more like a hood pulled over its face.
Good old Snorlax. What else can I say?