i think you can if latias is level67 you talk to the man in the space center(in mosdeep) and if he says that the rocket is 67%he will say that you can go to the moon the screen will turn black for 1-2seconds and you will be brought to the moon.in the moon you will move ahead and you will find deoxys.if it does not work when latias is 67 level it up to 77level and do the same this time it will work good luck.
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You have to train latios or latias to level 67 then go to the space centre and talkto the guy looking out the window.He will say there are 67 launches.He will ask you if you want to travel to the moon say yes and then go up the stairs on the moonand you will find deoxysI'm not sure if it is the right answer though.Another AnswerMy friend has a friend who did similar to the above and got a Deoxys on the moon. Apparently, you must catch all the Pokemon in Heonn, then talk to the guy in the space station and say you want to go to the moon. Then, whilst up on the moon you can find Deoxys. He is level 70 so bring strong Pokemon with you like Raquaza, Groundon/Kyorge or both, Regice, Regirock, Registeel so on so forth.
At level 67
Blaziken learns Sky Uppercut in level 67.
Deoxys: level up latios or latias to 67 and then go to mossdeep and talk to the guy that said the rocket launched safely! and then he says a rockets blasting off you better be quick! and you will end up on the moon. from here you will be able to get deoxys from here but be careful he's leval 70! Jirachi: I'm so sorry you have to go to a Nintendo event to get this little guy. Groudon: In the cave of origion Rayquaza:In the sky pear near pacifilog town
Level 61 in Generation II and III. Level 64 in Generation IV. Level 67 in Generation V.