After you go to lake acuity you must go to mt. coronet and catch giratina. After that,the major blackout in sunyshore city finishes off and you go there and battle the gym leader.
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Mars does not appear at lake acuity. If you beat mars at lake verity then go to the upper part of mt coronet and explore until you reach snowpoint city. If you're at lake acuity and beat Jupiter then go to the galactic HQ in veilstone city.
you have to go to lake verity first then go to acuity.
You'll need Pokemon Sapphire inserted into the DS and go to either Lake Verity, Lake Acuity, Lake Valor, Mt. Coronet, Spring Path, or Turnback Cave.
go to acuity lake (must have rock climb) then talk to Barry, then go to galactic Veilstone HQ building, and from there to Spear Pillar
You will have to go to Routes 216 and 217 and in the Acuity Lakefront, Lake Acuity and in the 5 floors of Snowpoint Temple in order to locate a wild Sneasel at which point you will be able to battle it in an attempt to catch it.