Pokémon GO/Catching Pokémon

When walking around the map, in the bottom right there's a bar that will show you nearby Pokémon. If you have the Pokémon registered in your Pokédex it'll show up in full colour, otherwise only its outline will be visible. If you click the bar, it will open to show you Pokémon that are reasonably close. If there are no PokéStops nearby, a Sightings section will appear that shows Pokémon that are within 200m. Otherwise, Pokémon will be displayed in front of their nearest PokéStop. if you go near that stop, the Pokémon will spawn.

Region-exclusive Pokémon
Certain Pokémon are exclusive to a geographical region. They cannot be encounter in the wild, and will not hatch from eggs outside their specified location. Seviper and Zangoose can never be found in the same location, but they have traded locations. Solrock and Lunatone have also switched locations in the past.

Ditto
Ditto doesn't show up on the map directly, it disguises as another Pokémon, such as a Pidgey or Rattata. When you capture one of these Pokémon, if it's a Ditto in disguise, after the shaking Pokéball animation, another animation will play showing the true form of Ditto. The following Pokémon can be disguised Dittos: Pidgey, Rattata, Zubat, Mankey, Gastly, Hoothoot, Sentret, Yanma, Remoraid, Zigzagoon, Whismur, and Gulpin.

Legendary Pokémon
Legendary Pokémon can only be captured via tier 5 raids. Mewtwo is only available via invitation to an Ex-Raid.

Mythical Pokémon
Only Mew is available via a sequence of Special Research tasks. Other Mythical Pokémon are not yet available in game.

Catching
When a Pokémon appears on the map, tap it to enter catching mode. You will see the Pokémon in front of you, with a CP displayed above them. This will be ??? if it's the higher than any you've previously caught.. There is an AR (Augmented Reality) mode toggle in the top right, that can be turned on or off. It's generally easier to catch Pokémon with AR mode off.

In this mode, swipe upward on the screen to throw a Poké Ball; the faster/farther you swipe, the harder the ball is thrown and the farther it goes. If you spin the ball before throwing it, you can activate a Curveball. The Pokémon will occasionally jump to dodge your throws but Poké Balls can still hit if aimed properly. If the Pokémon attacks instead, they will become invulnerable during the animation and Poké Balls will bounce off.

If the ball hits the Pokémon, then the Pokémon may try to break free before the catch is successful. Occasionally, Pokémon will run away in a smoke cloud after breaking out of a Poké Ball, which means you can no longer attempt to catch them. If the Pokémon hasn't broken out after three shakes, the catch was successful and you keep the Pokémon. There is also a small possibility of a critical capture, which will display a special animation and catch the Pokémon as soon as the Pokéball hits. Your rewards for a successful capture are ../Stardust and Candy/ for your species.