Deoxys, Jirachi And Jiroxy:
1.(Deoxys) First go to any mart.Fill out the questionnaire on the counter with the words "LINK TOGETHER WITH ALL". The shopkeeper will notice this and give you access to the mystery gift system. Use it and select wonder gift. Talk to the man in the green hat at a pokemon center and he will give you an aurora ticket. Fly to Vermillion city and take the ferry to Birth Island. On the island there will be a triangle shaped piece of land with a smaller triangle in the middle. Approach the mysterious triangle from below and press A. Go left 5 times and down 1 time.press A. Go right 5 times,up 5times. Press A. go right 5 times, down 5 times. press A. go up 3 times, left seven times.press A. go right 5 times. press A. go left 3 times, down 2 times. press A. press down 1 time, left 4 times. press A. press right seven times. press A. press left 4 times, down 1 time press A. press up 4 times,!!SAVE!!,and press A. get ready to battle Deoxys!!
2. (Jirachi) You can only get jirachi from ruby or sapphire. the way to get it is to fill all five stars on your trainer card(ruby and sapphire) by becoming the champion, filling the pokedex, winning all five contests and getting thier pictures drawn, best EVERY trainer in the game and the last one I do not knowwhat to do.
3.(jiroxy) Jiroxy, the god pokemon is made when you leave Jirachi and Deoxys at the day care center. Walk 10000 steps and the old man will give you an egg. Walk 15000 steps and the egg will hatch into Jiroxy.
*NOTE* you need the national pokedex.