There are four games in the Touch Generations cooking series:
Shaberu! DS Oryouri Navi しゃべる!DSお料理ナビ
Personal Trainer: Cooking / Cooking Guide Can't Decide What to Eat? / Sekai no Gohan: Shaberu! DS Oryōri Navi 世界のごはん しゃべる!DS お料理ナビ
America's Test Kitchen: Let's Get Cooking
1000 Cooking Recipes From Elle à Table
What's very interesting to me is that the first game was Japan exclusive
the second game was released in Japan, North America, Australia, and Europe
The third game was only released in North America
And the last one was Europe only
So out of four games, three regions each got their own exclusive game and then one game that they all shared. I think that's kinda funny xD
The last important thing to note is their various inclusions of Game & Watch games!
Shaberu! DS Oryouri Navi has Chef
Personal Trainer Cooking / Cooking Guide / has Chef
America's Test Kitchen Let's Get Cooking has Egg
I couldn't find that Elle à Table has any :(
all of which (according to gamefaqs) you unlock by doing a recipe and using the timer
