Article: Before you try to track Latios down yourself, trade with a friend first if you can. When Latios is added to your Pokedex, you'll be able to see its current location at any time, making tracking it down much easier. If you don't have someone to trade with, read on. Have a friend trade you their Latios, and then trade it back right away. You simply need to receive it in a trade in order for it to appear in your Pokedex. This is a good location to try hunting Latios, as it lets you switch areas quickly to change its location. Note: If you traded with a friend, use the location in your Pokedex to find Latios instead. If you are using the Super Repel trick, take one before you start walking around. Otherwise, walk around until a battle starts. If Latios still isn't appearing, you'll want to try changing its location. If you aren't finding Latios, enter and exit the Safari Zone. Every time you change areas, Latios moves to a new route. The goal is to keep doing this until it appears in the grass outside of the Safari Zone. If you traded and are tracking Latios with your Pokedex, don't leave the route that its on until you've found it. Once you've finally started the battle, you'll need to trap and then capture Latios.  If you have a Master Ball, throw it immediately to catch Latios. Make sure to use your trap ability (Shadow Tag, Mean Look) as soon as the battle begins. If you have Wobbuffet, Mirror Coat is very useful as Latios uses a lot of Special Attacks. Use Paralyze to help keep Latios from fleeing. Use False Swipe to get Latios down to 1 HP. Start throwing Ultra Bars as soon as Latios's health is low. Latios will try to run at every opportunity, but once you've encountered it once, you can see its current location on your Pokedex. Travel to its new location and don't leave until you find it again.
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Trade Latios with a friend, and then trade back (if possible). Fly to the Safari Zone. Use a Super Repel (optional) and walk around the grass outside the Safari Zone. Keep walking through grass until you've fought a few battles. Enter and exit the Safari Zone to change Latios' location. Catch Latios. Chase down Latios if it flees.