To determine the exact value of a Pokémon Power Ball, a number of things would need to be taken into consideration. Some of these things would be the age and condition of the Power Ball.
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If you have a Pokemon that knows Fling (Tm 68 I believe) then when holding Iron Ball, the Power is set to 130.
Iron Ball cuts the Pokemon's Speed by 50%, and allows Ground attacks to hit the pokemon if it has Levitate or is a Flying type. It's only really useful if you want your pokemon to be very slow, for example to power up Gyro ball.
lol do u know what Pokemon is? xD just weaken a Pokemon and throw a pokeball great ball ultra ball or master ball at him
There is no Light Ball item in Pokemon Yellow.
The difference between these balls in Pokemon is the likelihood that you will catch a Pokemon with each. A master ball theoretically gives you 100% chance of catching the Pokemon, but all the rest depend on how strong the Pokemon is, and on the percentage for that particular ball. The pokeball is the least likely, then the great ball, then the ultra ball. (Then the master ball, which is the best of all.) In some of the Pokemon games there are additional types of balls that are better at catching certain types of Pokemon.