Earliest Lv30s you'll encounter are on route 7 in the double (darker green/turquoise) grass.
You can't find it in the wild, but you can find a Pineco and level it up to 31.
you cant.i think the highest level wild i ever found was kyurem lv.75.
You'll need a Tynamo and evolve it at level 39. Otherwise, you cannot find it in the wild.
You can't find Krookadile In the wild, so I recommend trying to capture sandile and level it up from there.
You cant
Krookodile isn't found in the wild. You'll have to evolve Krokorok by leveling it up to level 40.
Wild Pokemon level 50 and higher can be found at seven island and cerulean cave.
it evolves at level 64 into a hydreigon
It'll be in the wild in Route 12 when the grass is shaking. But it is easier to get a female Combee to evolve at level 21.
Emboar can only learn Wild Charge from a TM.
You cant find a "Wild" Milotic. You must find a wild Feebas and give it max beauty then train it one level.
You must defeat wild pokemon or pokemon owned by other trainers another way to level them up is by using the item rare candy.