Necessary to level up to level 100 for battling?

This might be another noob question, but is it necessary to level up your pokemon to level 100 to battle (at Battle Maison or Wi-Fi battling). Assuming that your pokemon are fully EV-trained and their levels will be "standardized" to level 50 when battling, would there actually be any difference in stats if your pokemon are higher-leveled?

Solution 1:

They're standardized down/up to level 50 in wi-fi battles, and the Battle Maison will round them down (not up) to level 50. Unless there's a setting to battle without rounding that I'm unaware of, there's no point to leveling over 50 except for NPC fights in-game or to learn moves acquired at level 51+. There's no difference in EV bonuses or other stat changes due to level. I regularly fight with level 100 and level 50 pokemon in battle maison and Wifi, their stats are scaled as if they were both 50.