I believe you go to the Move Tutor in Blackthorn City.
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You can't teach a Roselia Solarbeam without using a TM and only finally evolved starter grass Pokemon can learn Frenzy Plant.
on route 228 there is a house talk to a man he let torterra learn frenzy plant ,same 4 infernape but he learn blast burn again with empoleon i think he learn hydro pump
Duah.Sceptile can learn Frenzy plant and if U didnt know that well your lost!
On route 13 in one of the houses there is a move tutor that can have your evolved form of a starter learn frenzy plant, blast burn or hydro cannon depending on the type
No.