Any possible way to get the team of my wishes?

Question

I want Flygon, Houndoom, Gallade, Metagross, Glacieon, and Syther?

for heartgold or diamond

Answer 1

You can get metagross in heart gold by trading a foretress with steven. ( it's a beldam, so you will have to evolve it) or go to safari zone for metang.

Scyther-Bug catching contest

Houndoom-Safari zone of heart gold, or route 7

Gallade-get a ralts in route 34 (heart gold) and evolve it

Glaceon- in diamond, get Eevee from Bebe in hearthome city (trophy garden) Then take it to route 217 in level it up, it will evolve then.

Flygon-wild vibrava/Trapinch in safari zone, just evolve one (heart gold ) (desert - 25 forest blocks after 20 days for vibrava or 25 peak blocks after 30 days for trapinch)

Answer 2

It's easy, but:
Glaceon isn't in HG
Houndoom isn't in D

But tell me, why Scyther a no Scizor??

Flygon (vibrava): rt.228 and Johto Safari Zone (desert - 25 forest blocks after 20 days for vibrava or 25 peak blocks after 30 days for trapinch)

Houndoom: johto safari zone (plains - 10 peak blocks) or houndour on rt.7

Gallade (Ralts): rt. 203 and south of 204 and swarming on rt.34

Metagross (Beldum): rt.228 swarming, pokewalker winner's path course, trade with steven for foretress or johto safari zone (forest - 21 peak objects after 70 days)

Glaceon: evolve eevee on rt. 217 (near ice rock)

Scyther: rt.229 and bug catching contest