People always complain about Rhyperior or Magnezone "ruining" their lines, but can we talk about the real shittiest cross-gen evolution?
Fucking Crobat. Imagine playing the originals and seeing this dangerous fucker with a huge jaw ready to fuck your shit up, and then playing the sequel expecting a meaner, badder evolution and instead getting a purple chicken nugget with no fangs.

Crobat is the worse cross-gen evo by far, it's just that it's been around so long it gets a free pass.