Yikes, Each DS or 3DS is it's own account, which means that the 3DS or DS you own is tied to your Sudomemo accounts, so you won't be able to use this account on your DSi XL.
Yikes, Each DS or 3DS is it's own account, which means that the 3DS or DS you own is tied to your Sudomemo accounts, so you won't be able to use this account on your DSi XL.