I found her at Feathermoon Stronghold. 33,44.
Kylanna Windwhisper, Master Alchemist

Very helpful, thanks! This is a rather tricky place to get to. My rogue got there stealthed by boat from (ACK!) Feralas I think.. ok but once @ Feathermoon get the flight path, and you will spend about 6-7 gold to level up your alchemy including the 1-2 recipes there.. sweeet. Cool recipes too... have fun peeps!

IS THAT FOR ALLIANCE?  WHERE DO HORDE TRAIN ALCHEMY ABOVE 225?

For Horde it is Doctor Herbert Halsey  in Undercity

No. Sorry.
Rogvar (Swamp of Sorrows)

where is feather moon stronghold... and is it a quest or is it just like a trainer that just gets u higher

What level do you have to be to train past 225?

You have to be level 35 to get Alchemy above 225

i got to alchemy 300 in stormwind city. i checked when i was lvl 35 no deal i checked back to see if she sells recipes at lvl 38 and bingo there it was expensive but there.

for horde, i bought my lvl 200 book at Alch store in Orgrimmar