Working towards evolution is one of the many goals a player has in the games, but some evolutions end up being a disappointment. Whether it's raising a Pokémon from an egg to its final form, or raising a starter until it evolves for the first time, watching Pokémon grow and change through the course of the trainer's journey is one of the many facets of the series that is so engaging. However, while there are plenty of fantastic evolutionary forms for players to collect, there are also some real flops that end up stuck in storage boxes.
One of the biggest reasons for a Pokémon evolution to become one of the worst comes down to poor design. Every generation in the series has a few ugly ducklings visually. While this isn't as big a deal for unevolved Pokémon, as players may choose not to catch and raise them, it's far more frustrating when that unfortunate design pops up at the end of an evolutionary chain. What could start as an adorable addition to a player's team could easily turn into a nightmarish monster after evolving.
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The only way to truly avoid some of these failures is to check each chain of evolution before dedicating the time to raise each Pokémon, but this can ruin the surprise of organically discovering each region's Pokémon. Not every evolution can be a Magikarp evolving into a Gyarados, and even though Generation 1 has pretty solid designs throughout all 151 original Pokémon, Muk is a definite eyebrow raiser. The evolved form of Grimer is basically just its pre-evolution, but bigger. Muk is a Poison-type and is nothing more than a sentient pile of ooze. This gives it the least original design and the prize for the worst Pokémon evolution in the entire
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