To change Landorus between its Incarnate Forme and Therian Forme in Pokémon games, you typically need an item called the Reveal Glass. Here’s how you can do it:
Repeat the process anytime you wish to switch between the forms.
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You will need to have the Reveal Glass and confirm the changes to Tornadus, Thundurus, and Landorus. This item was first introduced in Pokemon Black 2 and White 2 in Abundant Shrine if you bring the Landorus in his Therian Forme, but you can find it in X, Y, Omega Ruby, and Alpha Sapphire as well. To find it in X and Y, you will need to talk to a scientist near the entrance to Shalour City in Reflection Cave. In Omega Ruby and Alpha Sapphire, you go to Mauville with Thundurus, Tornadus, or Landorus to a store owner, who will give you a Reveal Glass.
if you wanna change your name make a new pokemon crystal or go on settings
You can't really change it forms... but the only way to let it change forms is to trade it to other versions like leafgreen, firered and ruby or sapphire
You make them SHINY! Hope i helped. Legoninga
Nearly every Pokemon in Pokemon Emerald have a chance of being female or male. If you have captured a female Pokemon, it won't change into a male Pokemon. It is impossible (without any cheats) to make all wild Pokemon male.
If you receive a Pokemon from a friend or from the Global Trading System, you cannot change it's name. The only way to make sure the Pokemon has a name that you like is to get it from a friend and ask the friend to change the Pokemon's name before they trade it to you. You can also trade Pokemon from one of your own games to another of your games, so the Pokemon will have a name that you chose.