NO
In indigo, you don't need hold items to evolve them through trade. Just trade a Rhydon. Your welcome :P
no.
You could trade it over the GTS or trade it from Pokemon pearl. On pearl its at routes 218 and 222. HOPE THIS HELPED YA!!!
Yes, much like it's predecesores (Ex. Pokemon Gold and Silver could trade to Crystal) Pokemon Platinum will be able to trade Pokemon from Pearl and Diamond.
Trade it! Trade it! Trade it with another Gurdurrr in pokemon indigo
Trade!
You could find them in rooms or trade with me for a leafeon lv 40.
There is armour fossil in Pokemon pearl, it is a fossil that has a shieldon in it, or you could trade with someone from diamond for a cranidos.
trade it in the trade center
No. Just like in Pokemon Pearl with the Pal Park you can only trade from Pokemon pearl to black, not back
trade it into Pokemon emreld
the only way to get a manaphy in Pokemon indigo is to trade it publically or ask one of your indigo friends to trade it privately if they have a manaphy Hope i Helped You! :) -Marshmellow10