I would go with my team from R/S/E from years ago.
1, Swampert
2. Gardevoir
3. Aggron
4. Flygon
5. Rayquaza
6. Dusclops (Dusknoir now thanks to Sinnoh!)
I choose Swampert because I love Mudkip, and the evolutions are total tanks. Plus he learns ice beam which will help defeat any Mega Sceptiles I might go against. Gardevoir is a very strong Pokemon in general and like its wide move pool. Aggron is a total beast in battle and now has a mega evolution. Flygon is a Pokemon you dont have to explain why they are on my teams. Rayquaza is my Pokemon that knows all of the strongest moves and Dusknoir is my weapon against Brawly and Norman (if there are gym rematches like in Emerald)
1, Swampert
2. Gardevoir
3. Aggron
4. Flygon
5. Rayquaza
6. Dusclops (Dusknoir now thanks to Sinnoh!)
I choose Swampert because I love Mudkip, and the evolutions are total tanks. Plus he learns ice beam which will help defeat any Mega Sceptiles I might go against. Gardevoir is a very strong Pokemon in general and like its wide move pool. Aggron is a total beast in battle and now has a mega evolution. Flygon is a Pokemon you dont have to explain why they are on my teams. Rayquaza is my Pokemon that knows all of the strongest moves and Dusknoir is my weapon against Brawly and Norman (if there are gym rematches like in Emerald)