pickachu
you do not
No
Synthesis
Scraggy
Ash's dad went on a Pokemon journey and we have not heard about him since you should watch the second episode of Pokemon it tells u in there about how ashs dad went on a Pokemon journy of his own
Mijumaru
You must deposit Pokemon in the computer if your party is full.
Yes, but only one at a time. The first one in your party will, untill you put another pokemon is put at the front of your party.
Yes, they follow behind you. You can get different pokemon walking with you by swaping first pokemon in the party.
the episode that ashs grovyle evolves is odd Pokemon out that's the name of the episode and the season is battle frontier
Sacred ash can be used to revive all fainted Pokemon in your party.
You don't "sell" Pokemon. You go to your party or PC box, click the Pokemon you want to get rid of, and select "release".