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.
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Gyarados cannot learn crunch by any means
blastoise learns hydro pump at 63
Blastoise will learn the move Hydro Pump when it reaches level 60
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.
blastoise learns hydro pump at level 44