yes any pokemon that evoles still has its old moves unless the only way a pokemon moves can change is if u change them when the game asks if you want to change the moves or with items for example ( TM 01 cut)
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when it gets to lvl 40 or 41, Note that its trapinch who learns dig, not vibrava or flygon.
(Give) Trapinch everstone and train Trapinch to level 41 and it learn (DIG) .
it can if you teach trapinch dig before you evole it
he can learn dig i don't know what level but he can if you use the TMthis is the best answer: trapinch can't evolve to get dig. On mine it evolved and it did not learned dig but i got another one and i did not evolve it and it learned dig on lv41,and it evolves on lv36 just in case if you want vibrath or flygon. .
Vibrava can either be taught Dig through TM28 or Trapinch can be stopped from evolving until level 41 so it can learn Dig and then evolve into Vibrava.