Gyarados cannot learn crunch by any means
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Gyarados will learn Aqua Tail at Level 35.
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.
Gyarados cannot learn water gun.
45
Level 32 :)