1) You can not hack pokemon or else you will be banned with no questions asked
2) The game is harder than the main games, there is no exp share or fly doesnt work of battle
3) The game is a mashup of both gens with all pokemon from all regions but you can only catch a few of sinnoh and the other gens in the kanto and jhoto regiona.
Some pokemon are saved for other regions, like hoenn which is coming soon.
4) Its an mmo because you need to grind for money to buy pokemon or items for other plays. The exp rate is different from the main games because unevolved pokemon level up faster than evolved stages.
5) Pro has a battling and Pve community, you can battle other members or npcs