To move a big boulder you need obtain the move Strength. To use the move outside of battle you need the Rainbow badge.
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Well any pokemon that can use the strength tm to move that boulder out of the way unless it's a big boulder you cant move that
HM04
any pokemon that can learn strength can push aside a big boulder
A Pokémon needs the HM move of Strength in order to move the big boulders. You can find the Strength HM in the Rusturf Tunnel.
With the HM move strength.