Yes, you would be able to get Keldeo in Pokémon Black, Pokémon White, Pokémon Black 2 or Pokémon White 2 without cheating devices, events or Mystery Gifts but your only option would be to find someone that is willing to trade you their Keldeo.
To get event Pokemon without using cheats or events is simply impossible without trading. If trading is not an option you must attend these events or use a cheat device.
migrate phione from Pokemon ranger
There is no way to get Mystery Gift without using the Wireless Adapter. Sadly, the events for Pokemon Emerald are expired and there will be no more events for this game.
They are only given out at Nintendo events.
No, not that i know of.
No, the only way is to do cheats or an event, and there are no more events for Pokemon Heart Gold because there is a new Pokemon game they are doing special events on.
You can get the mystery ticket in Pokemon Events. You can get the mystery ticket in Pokemon Events.
The only way to get Celebi on Pokemon Pearl without AR cheats is via event distributions. However these events are no longer being held or supported for Pokemon Diamond, Pearl and Platinum.
In sapphire you cant catch it without events or cheats:-)
It is a Shaymin (a grass/flying type legendary) obtained only through mystery gift events unless you use cheats.
you had to get alot of them through events or mystery gifts
you can't do that you need a action replay or R4 if you want cheats. or.... you could probably use the events to get legendaries.but i know you can't use cheats without a action replay