What Pokemon go together?

For, like, contests или something?

Well, Maractus and Cacturne.
(They're both cacti)

Two Ditto?

Gardevoir and Gallade?

Gardevoir and Alakazam?

Ralts and Abra?

Roserade and Bellosom?

That's all I got...

There's always Minun and Plusle, Пикачу and Pachirisu, Пикачу and Emolga, или Pachirisu and Emolga

I couldn't think of much, but here are a few...
Magby Evolution/Elekid Evolution
Lunatone/Solrock
Latias/Latios
Zangoose/Seviper (they're like, rivals)
Hope this helps!

how about volbeat and illumise. there are probably еще but thats all i can think of

i know these 2 pokemon dont look like it, but unfezant and cloyster go awesome in battle

огонь viruses water.
electric viruses water.
electric viruses rock.
ghost viruses hypnosis.

How about Grimer and Trubbish? They both pollute the Earth. Also Muk and Garbidor (I think that is how it's spelled).

Gallade , gardevoir , lucario, lopunny , roserade, medicham

Nidoking, nidoqueen , rhydon , aggron, kangaskan, tyranitar

Gardevoir gothitelle leavanny delphox florges jynx ( lady combo ) :-)