Pokemon that have claws, horns etc. Although Zangoose cannot learn the TM cut.
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Have one of your Pokemon use the move Cut.
Teach HM Cut to a Pokemon and use it on the tree.
First teach your Pokemon cut then you must beat the 2nd gym leader now press Start and press A on Pokemon your Pokemon will be displayed choose the Pokemon you taught Cut to and press A on it a menu will show up with diffrent commands choose Cut now your Pokemon will use cut.
One of your Pokemon must know cut and then you go up to the tree and press a to use cut to cut down the tree
First you need a Pokemon with-HM 01Cut,such as Persian.Also a Pokemon with surf.Then use cut on the door and it will open