You earn the following: Expert mode, Tanks in versus mode, and Graphic Equalizer.
And of you mean expert mode badges you get: New tittle screen, and if you get badge for Venom in expert, you get on foot versus.
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You go to Victory Road
You can get Rock Climb by first getting all 16 badges. Rock climb cannot be found as an HM in the ground somewhere, but from a person. Professor Oak will give you it as a prize for getting all 16 badges.
By symbols I guess you mean "Gym badges" you get them by defeating each GYM owner in the various towns.www.mategate.co.uk
It depends in which Pokemon game, but in the newest games (Diamond/Pearl) You will need to earn badges to get a higher level for them to obey. if you have all 8, all Pokemon will obey you.
you get all 8 gym badges