Pokemon Pearl

hi
How do you get past Pal Park??
what pokemon are you meant to use in it? because i cant enter
But ive already beaten the elite four and got the national pokedex

Pal Park is for catching your old pokemon from your pokemon GBA cartridges, emerald etc. So unless you migrate pokemon over, you can't get past the Pal Park.

is there any way of going in if im using the no$gba emulator?

No, there's no way to use migrate with no$gba at the moment.

is there any other emulator that can migrate??

Not at the moment, no.

it only works in the original nds at the moment, because at a certain point you need to insert a ruby, sapphire, emerald, fire red or leaf green cartridge in the gba slot.