It is because they are worried that they will get hit and hurt.
footballers need good balance so they don't fall over when they have the ball.
Throwing the ball.
When catching Celebi, you should have a cherish ball. Throw it and it will be an instant catch. (DO NOT USE A MASTER BALL OR ANY OTHER BALL.)
because they might fall over when kicking the ball
use it any Pokemon that u have trouble catching u don't need it to catch mesprit or cresslina i used pokeball
By catching the ball, throwing the ball, and hitting the ball.
Jump when retrieving the ball.
If you can't catch Raikou with a poke ball, great ball, or an ultra ball,.. try catching it with a master ball. it may be very expensive but once you catch Raikou its worth it .
Um..................................... Because they need to kik a ball lol
Because it can help them to judge the flight of the ball and the angle it is coming into them at.
a baseball glove that is catching a ball
by catching a random pikachu and you might get a light ball