http://www.tppcrpg.net/training_challenge.php
its called the training challenge
Step 1 : Catch a Zangoose on the maps ( use wiki to find which map)
Step 2 : Go to your "Team Rocket" page and buy Life Orb.
Step 3 : put these moves on your zangoose
Thrash
Ice Ball
Blast Burn
Also install the life orb as item on it.
Step 4 : Enter the training challenge with the link above and select the zangoose to be your fighter
Step 5 : in the training challenge battle you battle one pokemon at a time. most pokemon will die with thrash. Ghost pokemon will require ice ball and steel pokemon require Blast Burn.
In a couple hours you can reach level 200-250 with the pokemon. that should be good enough right now for reaching top 5. you will recieve golden fennekin which is worth 20-25x and can get you a few goldens.