Turtwig learns it at lv 37.
Grotle learns it at lv 42.
Torterra learns it at lv 45.
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You have to upgrade your torterra to level 39 before it can learn synthesis.
In the Pokémon series of video games, Torterra, the final evolution of Turtwig, is obtainable by leveling up Grotle to level 32. At level 32, Torterra learns the Earthquake move. Afterwards, it learns Leech Seed at level 33, Synthesis at level 39, Crunch at level 45, Giga Drain at level 51, and Leaf Storm at level 57.
Torterra can learn Leaf Storm at level 57.
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.
Torterra is capable of learning Earthquake at Level 32, at 33 it learns Leech Seed, 39 it learns SYnthesis, 45 it learns Crunch, 51 it learns Giga Drain and at Level 57 it learns Leaf Storm. It can also learn Frenzy Plant. If you go to Route 25 and look around you will find a man that will teach it to torterra for free.