When you are collecting the Dragonballs, you will unlock an area called Snowy Highlands. Go there and get up to the frozen river. Use the fly pad to fly across the river. When you get across, go north into the area with four Kuma Mercenarys. Defeat them, then go straight into the wall to the north. Punch it and a cave will be revealed. Inside there will be a Tyrannosaurus. Defeat it, and it will drop a +3 Power Capsule.