I have a gc and pokemon xd i bought but never played. Is there any value in anything i can get from this, or since they aren't xy or newer they can't be used online with oras anyway?
There's a couple of unique things from XD that are worth getting.
Zapdos gets Extra Sensory, Baton Pass, and Metal Sound, all three of which are pretty cool.
Poochyena gets Heal Bell, which I guess is cool
Duskull gets Helping Hand, which had a niche in Gen V VGC as a TR supporter. Probably not worth it anymore because Aegislash, but still is an option.
Mawile gets Sing, which could be cool on devensive sets.
Both Lunatone and Solrock get Baton Pass, which is actually neat in low tier matches (plus since they're gender-less, you get ones with cool balls)
Togepi gets Tri Attack, which is neat in throwback matches (it doesn't get STAB anymore in Gen VI)
Beedrill gets Baton Pass, which might be fun now that Mega Beedrill is a thing
Electabuzz gets Follow Me, which is fun in doubles because of Motor Drive
Those are the ones I can think of off the top of my head. Might've missed a few though.
Edit: Scratch Togepi; I forgot about wifi being dead for DS games. -.-
Guess it's still an option, but eh.