Capture Mechanics
For the most part, to obtain a Pokemon, you have to purchase it in its unevolved form and then evolve it later if necessary. However, some facilities may allow you to capture a Pokemon using Poke Balls instead. For some Pokemon, this is the only way to obtain them. If you are in such a facility and you wish to capture a Pokemon using a Poke Ball, you simply state which ball you are throwing and the entire round is replaced with the single action of throwing the Poke Ball.
If a Pokemon can be captured, it will have an additional stat known as Capture HP or CHP. This number is based on the Pokemon's in-game capture rate - the higher their capture rate, the lower their CHP. Thus initial CHP values can range from 45 for something relatively weak and common like Zubat to 297 for legendary Pokemon like Landorus. Each Poke Ball, when thrown, deals damage to the Pokemon's CHP and is then consumed. When a Pokemon's CHP reaches 0 or less, the Pokemon is captured.
The damage a Poke Ball deals to a Pokemon's CHP is equal to:
(Ball Strength - Target's Capture Resistance) * Major Status Modifier - Each Ally's Capture Resistance
Here is an explanation of each item in the above formula:
- Ball Strength is a number determined by the kind of Poke Ball you are using, and possibly depending on other circumstances. Many kinds of Poke Ball have a standard Ball Strength of 15 which is boosted to 36 given the right location, right Pokemon or right effects.
- A Pokemon's Capture Resistance is equal to 10% of its current normal HP, rounded down to the nearest whole number. If the Pokemon's energy is at the maximum of 100, the Pokemon's Capture Resistance is increased by 10. Pokemon that have been knocked out have no Capture Resistance.
- Major Status Modifier is determined by which status effects the Pokemon to be captured is affected by:
- If the Pokemon is frozen, Major Status Modifier = 2.5
- If the Pokemon is not frozen but it is asleep, Major Status Modifier = 2
- If the Pokemon is neither frozen nor asleep, but it is burned, poisoned or paralyzed, Major Status Modifier = 1.5
- If the Pokemon is not affected by any of the above status effects, Major Status Modifier = 1
If the damage to a Pokemon's CHP is less than or equal to 0, the Poke Ball has no effect.
If the Pokemon has a low starting CHP and you reduce its normal HP by a lot and inflict a major status on it, you might capture it with your first Poke Ball. Often, however, your first Poke Ball will do some damage to the Pokemon's CHP but not enough to capture it outright. When this happens, the Pokemon regains 12 energy in that round (even if it would be unable to act), and then one lot of end-of-action and end-of-round effects occurs. If the Pokemon already had the maximum of 100 energy when the capture attempt was made, it instead performs a full round's worth of attacks while your own Pokemon do nothing, and the full amount of end-of-action and end-of-round effects occur.