Golem, a Megaton Pokémon. Once a year it sheds its bedrock shell and grows larger.
– Ash’s Pokedex
Golem evolves from Graveler when traded (like Alakazam, Machamp and Gengar in Gen I). Golem looks like a turtle stuck in a rock. Its name isn’t all that interesting or creative, since it’s an actual English word.
Stat-wise, it has great Attack and Defense, but everything else is below-average. Plus, being Rock/Ground type, it has many weaknesses, including double weaknesses to Water and Grass. In Gen IV and V, Golem only learns Status and Physical moves by level-up.