No, you don't get treats from leveling up.
Like other Pocket Monster games, you get shiny Pokemon rarely while hunting wild ones, it's a matter of luck.
There are none in the wild, however you can evolve a Magneton by leveling it up in Mt. Coronet.
Sadly you can NOT find a wild magnezone. but you can evolve a mageton by leveling-up in mount. coronet.
Krookodile isn't found in the wild. You'll have to evolve Krokorok by leveling it up to level 40.
it was only up for a few days by accident
its leveling of up side down, using gravity as a slope.
The only ones I can remember were: Wild Angles and Born to be wild.
no Pokemon can learn rock smash by leveling up you have to get the hm.
you have to train it ( by wining battles, beating wild Pokemon) and it will gain experience Soon if you train it a lot it could evolve ( most Pokemon do that by leveling up)
It picks up health and ammo boxes for you randomly.
No, the TM Dig is required to teach Lairon Dig. It cannot learn Dig by leveling up.
Mareep evolves into a Flaffy by leveling up at lv.15 and then it evolves into an Ampharos at lv.30 (also by leveling up).