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Going by the two that we see, his entire team is probably made out of 600 BST legendaries. Some likely candidates:
>Latios
>Deoxys
>Heatran
>Cresselia
>Mew
>Celebi
>Jirachi
>Manaphi
Personally I'd go Darkrai, Latias, Latios, Heatran, Deoxys, and Cresselia.