How to Beat Pokémon Mystery Dungeon: Explorers of Time/Darkness/Sky
Note: PokéPark Wii: Great Adventure doesn't exist—you're likely asking about Pokémon Mystery Dungeon: Explorers of Time / Darkness / Sky (DS). Here's a progression guide.
Core Loop
Take jobs from Bulletin Board / Outlaw Notice Board
Enter dungeons → turn-based grid combat, hunger management
Recruit Pokémon by defeating them (chance based on level difference, leader's IQ skills)
Level up, learn moves, evolve (post-game for starters)