Oniyoru

No, it won't get EVs, so they will level up weaker.

http://bulbapedia.bulbagarden.net/wiki/EV

For the pokemons...all you need is to get the .pkm files from that .pcd...PokeGen and PokeSav can help you with that http://www.projectpokemon.org/pokegen/

And then sending then via GTS to HGSS http://www.pokegts.us/ is great for that

Note: You'll need a WEP connection for that just take off any pass from ur connection so HGSS can connect online

For the items (like routes) as far I know you need an AR

that's how the games work. you can only fly in the region you're in. fly to mt silver to switch. possibly somewhere else too, but i know mt. silver works. that's how the original games worked too. they kept that "feature".

Route 26 and Indigo Plateau both work too.

I was able to emulate Wonder Card with a Pokemon distribution rom. During my testing process I got by mistake a Japanese Event Mew, which now of course prevents me from getting the NA Anniversary Mew.

I want to know If I can get another one via Mystery Gift, if I deleted the card and release the pokemon, or if there's another way.

Note: I still dun have a AR so I can't use Pokesav to get my save from DS and edit.