There are many ways and I do not now all of them(sorry) but I believe I can help. In Jubilife go to the Jubilife Poketch Company. Talk to one of the rightmost guy after you get all the gym badges (or any badges) and he'll say hi, hi you're patience is rewarded and will give you an app. Also, As you go on, you will get more apps. At Sunyshore, (after you beat Cyrus in Distortion world) there will be a scientist in one of the houses (must use rock climb) who will ask you for a Pokemon with a specific nature. He will not repeat the nature so read carefully and write it down. Then go to your box, put a Pokemon with that nature in the team and talk to him. He will give one app and ask for another nature of a Pokemon. Repeat. That is all I can say, don't know any more ways.
also in solaceon town go into the day care centre talk to the man sitting down he will give u one
There is a total of 23 apps available in Pokemon Platinum.
Digital watch
Pedometer
Memo Pad (president of poketch need oreburg badge)
Dowsing machine (route 207)
Calculator
Pokemon List
Friendship Checker (eterna city Pokemon center)
Berry Searcher (208)
Day care checker (guy at daycare)
Counter (dept store)
Marking map (poketch need veilstone badge)
Coin Toss (hotel valor lakefront)
Calender (show a guy a Pokemon with serious nature)
Roulette (show quirky)
Pokemon history (solanceon town)
Analog watch (poketch veilstone badge)
Link searcher (hearthome city)
Move tester (poketch snowpoint badge)
Dot artist (show naive)
There are more but u get those after u beat the elite four =]
It is to the right of the Tv Station in Jubilife city on the road going to Canalave city.
jubilife city
Talk to the poketech guy in jublife city who is inside the poketech building. If you have won the fourth gym badge, he will give you the marking map app.
you get the dowsing machine from dawn or lucas after beating the team galactic in eterna city
Go to Jubilife City and u will need to go to the Pokemon school. There u will talk to your rival and he say some stuff that he learned. Then, u will talk to the poke'tch president and he will say if u want a poke'tch, u will need to talk to 3 clowns around town and u will need to answer questions. One is in front of the Lottery, ones by the poke'tch building, and the other ones by the mart.
You can check the time (8:00PM-4:00AM=Night time. It's day after that). Or you can see the shadings of the screen; it's bright at day and darker at night.
the poketech company is in jubilife
Jumblife city
I am thinking you get it from the poketech company. correct me if i am wrong
it app for
You must have 7 badges then talk to the president of the poketech company in jubilife city and he will give you the app
jubilife city
In Jubilife next to the TV Station in the north corner
Talk to the poketech guy in jublife city who is inside the poketech building. If you have won the fourth gym badge, he will give you the marking map app.
i d'ont no but i no where you can get it go to neosseker
Your friend, Dawn will give you that, along with the dowsing machine for your poketech
well wat u do is go to the poketech company and in 2009 talk to the president and he will give you 765 master balls!
get a drowsing macheine (item finder) in the poketech and press any where on the touch screen