Unfortunately, you can not rebattle Gym Leaders in ORAS.

Can you rematch may Oras?

You can battle May once after the credits, on Route 103. (Source) Once you have defeated her, however, you cannot battle her again.

How do you rematch the gym leaders shield?

You can go back to Wyndon Stadium and challenge Gym Leaders or Leon. This is useful for levelling up your Pokemon and gaining money (you can get 10,000 currency from winning).

Does Brendan have a crush on May?

May was completely smitten by his actions, and when Brendan offered to take her home, she winked and said “Sure thing! I’d love the generous escort from such a heroic young man like you.”

How many times can you rematch a trainer in Oras?

Regular Trainers are eligible for rematches after obtaining the Balance Badge; once it is obtained, if the player is on a map with eligible Trainers, each Trainer on the map has a separate 31% chance to demand a rematch every 255 steps.

Can you fight the elite four more than once sword and shield?

Much like challenging the Elite Four in previous Pokémon Games, to beat Pokémon Sword and Shield you compete in a Champion Tournament. Once you’ve completed the game, however, you can go back and compete in Champion Tournaments again and again to prove you’re still deserving of the title.

How do you get a rare Leon card?

For the last one, you’ll need to battle your way through the newly-opened Battle Tower in Wyndon (where the Rose Tower was). After completing enough battles to qualify for Rank 4 (a dozen or so), you’ll fight Leon. Win and you’ll earn Leon’s Rare League Card.

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