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Crustle is a Bug & Rock Pokémon which evolves from Dwebble. It is vulnerable to Rock, Steel and Water moves. Crustle's strongest moveset is Smack Down & Rock Slide and it has a Max CP of 2,542.
"Competing for territory, Crustle fight viciously. The one whose boulder is broken is the loser of the battle."
Furry Cutter and Smack Down are polar opposites of each other; the former focuses on fast energy generation at the cost of stronger damage output, while the latter forgoes energy gains in favor of more STAB damage. Either option can be viable depending on the situation.
X-Scissor costs the least amount of energy, and provides decent Bug-type coverage backed by STAB. Rock Slide is a very efficient charge move, costing a moderate amount of energy with a very respectable 1.8 DPE (Damage Per Energy). Rock Blast is inferior.
Crustle fits a relatively unique role as a Bug/Rock Pokemon, gaining advantages over various other Bug-types, such as having coverage options against popular Flying-types. Unfortunately Bug-types are typically not favored for the meta due to poor relevancy, unspectacular movesets, and inferiority to other typings. Other Pokemon with Rock-type coverage perform better in the meta, and Crustle's bulk isn't particularly impressive either. It also doesn't help that Crustle has a major weakness against incredibly common Water-types.
Fast access to Rock-type coverage is particularly valuable against Fire-types meant to counter common Steel-type Pokemon, while Bug-type coverage has more significant value in Ultra League against popular Psychic-types. However, Crustle's bulk is still a concern, and needs to be wary of other Bug-types with a sub-Steel typing which compete for its role.
With a max CP of 2542, Crustle has no business in Master League unless it wants to be crushed.
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