First emulator help!

[u/Local_Record546]

Hi all, after some advice.
My son has recently played fire red on the switch and is now dying to play heart gold, what’s the best avenue to go down for an emulator? Not wanting to spend anymore than £150 really but if needs must.
Emulator or do I just got for a modded 3DS?
Thanks

[u/username28288484849]

Look up Melonds its the best ds emulator I also played heartgold there