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
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In Pokemon Diamond and Pearl you will have to go to route 228 and talk to an old man, I think you might have to do the same in Platinum.
The grass starter moves in pokemon are frenzy plant and spiky sheild
You can't teach a Roselia Solarbeam without using a TM and only finally evolved starter grass Pokemon can learn Frenzy Plant.
No one in the game will do that for you.
In order to get Frenzy Plant in Pokémon LeafGreen, you would need a Move Tutor on Two Island teach it to your Bulbasaur, Ivysaur or Venusaur.