[PS1][2000s] Adventure 2 players game that has an evil tree sub boss

Platform(s): Playstation 1

Genre: Adventure, 2 players, JRPG (?)

Estimated year of release: I think 2000s

Graphics/art style: Common ps1 pixel artstyle

Notable characters: I don't remember but I believe the MC is a boy

Notable gameplay mechanics: Side scrolling and avoid obejcts on your way, also maybe you can throw something to fight against the enemies but I'm not sure.

This is a 2 players game btw.

Other details: I don't remember much except for one stage where you have to fight a boss evil tree. It will spit glowing/fire orbs at you and you have to jump to avoid it. After you have defeated the tree you can access to the next level.

I played this game for quite a long time ago and I really want to see it again. I hope you can help me out, thank you in advance.