Nothing bad if you truly bought the bike regularly its fine you can still get the bike voucher though just for fun and keep it with you for fun.
You have to upload it from FireRed, LeafGreen, Ruby, Sapphire, or Emerald.
Either by using the HM Strength or by using the HM Rock Smash
Since dive is not a HM in firered you will have to trade a Pokemon to a friend that has ruby, sapphire or emerald then using that game use the HM Dive to teach the move Dive to that Pokemon trade it back so firered can have that Pokemon again it will still have Dive however you cannot use it to dive underwater.
nope they stay the same lvl, hope this helps =)
you can get egg of Dragomander(Charizard with Out range) by putting Charizard(female) and Dagonite(male), Dragonite must know move "Out range" and by giving them in "Day Care Centre" on island 4.
no.
when you find that Pokemon if you have a master ball with you use a pokeball and you will capture it
no you can only trade using a game boy to a game boy with the link cable.
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You have to upload it from FireRed, LeafGreen, Ruby, Sapphire, or Emerald.
Without using cheats? Well then you should challenge the gym leaders and defeat them the old fashioned way: Battling.
You can't
short answer: no
No silver is not compatible with firered.
By using the directional-pad on your system of choice
Evolve the Eevee you get given at the top (using the back entrance) of the Pokemon 'Mansion' in Celadon using a Thunderstone.
The only legitimate way to obtain Celebi and Mew is through a Nintendo event. In FireRed and LeafGreen you will need an event-only item to travel to the last two islands where you can catch those Pokemon