your Pokemon aren't supposed to gain exp points in the battle arena
The elite 4s Pokemon grow by bout 11 levels you're suposed to battle them again
you give it massages and poffins and stuff like that and give it proyiens and berries plus dont let it feint in battle
all you have to do is battle people
no, Pokemon don't evolve there they jut grow levels
train in victory road. that's what i do
yes depending on how long you walk,your pokemon's level goes up by one
attatch a leaf stone and grow 10 levels
it makes them happier and lets them grow levels faster. PS you can spread it by putting other Pokemon in your party.
Pokemon battle with other Pokemon in the Pokemon games! Each trainer is allowed 6 Pokemon in his team,if you catch more than 6 they will be stored in your pc and it is the trainers job to take care of the Pokemon. They learn different moves and level up. The highest level is level 100 they need more and more exp as they grow to higher levels. When they get hurt take them to the Pokemon Centre or use a potion, antidote,max heal etc....
Happiness evolves certain Pokemon like chansey. To get happines massage your Pokemon in veilstone and give it heaps of lemonade. Then grow it some levels.
No, only it's strength and, possibly, moves.
Nothing really, they only grow levels.