Just kill people online.
You gain 2 experience points if you win a fight and 1 if you lose a fight.
You play the game and progress through the rankings as you kill more enemies and gain more experience.
to set up a team deathmatch go to private match you can invite players but they will not search for a game and find yours, you will not gain experince points in private matches. if you want to host a match on xbox live and gain experience points you have to have a good connection and stay in 1 match for quite a long time.
Keep fighting to gain experience points.
Trade your Pokemon then use the traded Pokemon to gain boosted experience points plus have it hold lucky egg to gain maximum experience points.
You can train the Athletics skill by running (0.03 experience points per second), and swimming (0.04 experience points per second). You do not gain any experience points when sneaking.
The same way as leveling up normally. You still require same experience to level up from 1-70, and still gain the same experience as non-prestiged.
No If you play campaign online you can get exp.
I believe what you are reffering to is a weekend where the developers have allowed players to earn Double XP. This was somewhat common in Call of Duty 4 This means that should you get a kill in a standard Team Deathmatch for example, you will gain 20 points instead of 10. Challenges are also effected.
Answer: No you don't gain experience points, when you are battling with your friends ds, the only time you are going to get experience points in the Pokemon series is battling wild Pokemon and battling against trainers, gym leaders etc.
Yes you can unlock extra perks on call of duty four but you have to be playing on live and gain ranks. to do this you must win round with 1 or more kills.
Fight strong opponents and have your Pokemon hold lucky egg.