Ever since Pokemon Emerald have introduced the 'Battle Frontier', it became a popular Pokemon feature in the Pokemon games. The only Pokemon games so far to feature the Battle Frontier is in Pokemon Emerald & Pokemon Platinum. I'm just curious that ever since Pokemon Black2 & Pokemon White2 came out, it didn't feature a Battle Frontier and it only has the Battle Subway. Nothing wrong with that, I just figure if Emerald & Platinum have a Battle Frontier, why not BW?