better to ask him a favor if he could put 1 team only so u can beat him easily and get the coupon rewards...coz thats what ive done before and the time when i was ranked number 1 in ranked battle i also put one team only so my friends can get the coups easily...hope that man is kind to help u to get some coupons...and btw even if he have only one team in ranked battle he need to start a battle w/other opponents first so his 1 team in ranked battle would be refreshed or updated on 1 team only in ranked battle...

there is bro...everytime u manage to rank up for the first time u can get free coups :)