How To Get Ho-oh In Pokemon Platinum?

I Just Went To Valor Lakefront, You Go Into The House With The Pool In Front Of It. Than You Talk To The Man Standing At The Window Known As "The Game Director" He Will Give You A Diploma For Seeing Every Pokemon In The Sinnoh Region. Than You Go Down 2 Staircases Until You Reach A House You Go In And There Should Be A Man Sitting At A Desk. Speak To Him And He Will Either Say "Whirl Island" Which Means You Will Find Lugia, "Tin Tower" You Will Find Ho-Oh & Space Dome You Will Find Deoxys.

It Worked For Me On Pokemon Platinum.
Hope This Helps.

You can't. You have to migrate it, or trade with someone.

You have to have an Action Replay DS.

You can't unless you hack,migrate from fire red or leaf green after mystery gift either that or you trade with someone who has got one and I have a gold hack arceus I got in a trade I traded one of my mewtwo's from fire red its lvl95 and its awesomely powerful I'm working on the moves

You can not get HO HO in pokemon Platinum. But you can in heart-gold.

Migrate and trade. .  That is the only way. .

Trade it from ss/hg or ar codes

Its impossible to get ho-oh transfer from any gba game or pokemon xd

Go to the sphere pillar and run/walk at the back of it and use the spiral hunter

You could but you need an action replay you trade from heartgold or you can migrate from emerald

You could trade someone from the gts, migrate after getting from pokemon Colosseum or buy action replay and cheat. Also you can trade with heart gold o  wait and see of there will be an event

Get Ho-Oh on pokemon colleseum, thn grade to a gba game (ruby, sapphire, emerald ect.) Then when you get Pal Park after the National Dex. Then migrate Ho-oh rom the gba game to Platinum. Same with Lugia on XD: Gale o Darkness. Hope I helped. C:

Trade