Pokemon Alpha Sapphire
Yes. Most likely horde hunting(encounter 5 pkmn at once to increase odds), random encounters and soft resetting for legendary Pokémon.
Yes, although those games 3d functions won't be accessible
In my own opinion both are equally good, only slight differences mainly to do with legendary is in which game, in my own experience I've preferred Pokemon Omega Ruby, because Groudon being a fire/ground type has always held a special place ever since I played Pokemon Ruby for Game Boy Advance system.
No I have got a lot of games with those rating if you are scared about it get it digitally
Yes, but that is my opinion
Thank you for your question LAGO. This game is compatible with the 2DS system.
Thank you for your question artsymom, Yes this game is compatible and most Nintendo 3DS games are compatible with the Nintendo 2DS. There are a small selection of games that are "Only For New Nintendo 3DS" that will not play on the Nintendo 2DS. These games will say "Only For New Nintendo 3DS" on the box.