The entire concept of having animals evolve into insanely-powerful beast monsters by beating the crap out of others in battle (or by being exposed to stones, being traded, etc.) is pretty ridiculous in and of itself. But it's not too difficult suspending your disbelief when the end result is a fire-breathing dragon who remains loyal to you (despite the fact you're forcing it to fight a bird who shoots lightning). But there are some specific evolutions that are extremely weird, even in the already-weird field of Pokemon evolutions. These are the 10 weirdest evolutions in Pokemon.
10. Cubone into Marowak
Cubone's life kinda sucks he's so upset at the death of his mother (remember, this is an entire species of Pokemon, meaning they all are bereaved over the deaths of each of their individual mothers), that he literally wears her skull, which may not be the most emotionally-healthy coping tactic. Then again, in some deeply, deeply messed up way, his mother is still protecting poor little Cubone since her skull now acts as his helmet. It's definitely indicative of some kind of creepy Norman Bates/Mother relationship, but it's mostly harmless.
Where it gets weird is when Cubone evolves into Marowak. Essentially, Marowak's just a bigger Cubone, which isn't all that weird. What is weird is that Marowak is defined by having gotten over the death of its mother (remember: AS A SPECIES, Marowaks have ALL gotten over the deaths of their individual mothers), but still wears a skull on its head. But it's specifically NOT its mother's! Meaning
Marowak found some random dead Pokemon's bigger skull and is wearing that now? Something tells me Marowak hasn't quite reached the closure it claims to have.