In mystery dungeon these are all the moves that hit all enemys on room:
Attack Order,Dark Void,Vacuum-Cut,Growl,Heal Block,Heat Wave,Memento,Spore,Powder Snow,Sweet Scent?Silver Wind,Discharge,Roar of Time,Earth Power,Spacial Rend,Ominous Wind,Odor Sleuth,Draco Meteor.
As you can see the only water or fire type move that hits all enemis in room is heat wave but torchic cant learn heat wave torchic can learn these moves
Lv.7 - Focus Energy
Lv.10 - Ember
Lv.16 - Peck
Lv.19 - Sand Attack
Lv.25 - Fire Spin
Lv.28 - Quick Attack
Lv.34 - Slash
Lv.37 - Mirror Move
Lv.43 - Flamethrower