There is no specific time that any of the Trophy Garden's inhabitants are available.
Castform will appear only 5% of the time, the same as all other species in the garden.
you have to get the natinol dex or go to the trophie garden.
none sorry but if you have the national pokedex you can go to mister blackot save and then talk to him. he will start going on and on then he will say a.... came up and kissed me on the cheek. if it does not say castform where i put ..... turn the ds on and off again and see if he says castform. if he does go into the garden catch castform and bring it to him. if still he does not say cast form tun it on and off again and you know what to do if he says happiny or ditto.
You can catch kirlia outside the trophy garden. NOTE: You CANNOT catch a kirlia in the trophy garden.. only OUTSIDE of it. in that patch of grass south of the trophy garden.
Castform is not obtainable in Pokémon X and Y, and thus you must transfer it from any Generation V game (Pokémon Black, White, Black 2 and White 2) through the Poké Transporter and Pokémon Bank apps, ask someone to trade you one or look for it at the GTS.
You have to get the National Pokedex by catching all the Pokemon in the Sinnoh Pokedex. Then you go to the Pokemon Mansion and talk to the guy who owns the building.
In the trophy garden
you can catch one eventuly in the trophy garden
you speak to the owner of the trophy garden he says he sees it then you go catch it in the trophy gardeITS REALLY GOOD
Castform can be found in the Trophy Garden in Pokémon Diamond.
No, you have to go to the Pokemon manshion, talk to the master (First door to the right) until he says "a cute eyed castform ran up and gave me a smooch on the cheek..." after that you need to go to the trophy garden (DON'T get annoyed because it is VERY hard to catch it!!).
you have to get the natinol dex or go to the trophie garden.
You can find the Pokemon Castform in the Trophy Garden in Pokemon Diamond, although it is a pretty rare chance.
you find it in the throphy garden after you complete the shino pokedex
Talk to Mr. Backlot of the Pokemon Mansion, he will rarely say that Castform will be in the garden at Lv. 16, 18. It has a 5% encounter.
after you beat the the bad people in the weather institute in ruby emerald or sapphire one of the good people will give you a castform.
you get castform in the trophy garden just talk to mr backlot its down to chance tho and the list grows when you get the nationel pokedex
to see any rare Pokemon are in there