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Blastoise never learns Crunch. Blastoise does not learn Crunch, but it does learn Bite. This is when it is a Wartortle (or Squirtle) and is on level 16. If you have a Blastoise on level 16 (which is not really possible), it will learn Crunch.
In Pokémon FireRed, Nidorina would already have the moves of Growl and Scratch upon capture however it will learn Tail Whip at Level 8, Double Kick at Level 12, Poison Sting at Level 18, Bite at Level 22, Helping Hand at Level 26, Fury Swipes at Level 34, Flatter at Level 43 and Crunch at Level 53.
Gyarados cannot learn crunch by any means
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Arcanine itself cannot learn Crunch from leveling. However it's unevolved form, Growlithe, can learn Crunch at level 42. You can also hatch a Growlithe with the move Crunch via breeding.