you can get 28 dig on route 114
There is not a tm for bite or crunch.
TM28 Dig in Pokemon R/S is on Route 114 inside the Fossil Maniac's house.
you can get it in seafloor cavern
at the game corner
In the Safari Zone
Zigzagoon can be taught Dig at any level once you have TM 28. TM 28 can be found in Route 114.
There is not a tm for bite or crunch.
TM28 Dig in Pokemon R/S is on Route 114 inside the Fossil Maniac's house.
Thunderbolt
Yes, Tm's in Pokemon Omega Ruby and Alpha Sapphire are re-useable
Double Team
Trade.
you can get it in seafloor cavern
25
at the game corner
In the Safari Zone
double team