go to there base and then go to there PC.Look to the right and you can see there flags . Press A on it and you will get there one of there flags . Take
take 50 flags in the underground
same way you would get two flags. steal them from other trainers.
To remove rocks, you must simply have the following: -Another DS or DSI and another Pokemon Diamond/Pearl game -A friend with the items above -Action Replay (and code for 100 captured flags) How to remove rocks: To remove rocks in your base, you must simply steal your opponent's flag from his/her base and then go to your PC and press 'Put Away', then remove (a) rock(s) Stealing 1 flag (bronze flag)- You can remove 1 rock 3 Flags (Silver flag)- You can remove 5 rocks 10 Flags (Gold flag)- You can remove 10 rocks 50 Flags (Platinum flag)- Able to remove all rocks Note: When you've reached Platinum Flag, you will earn a star on your trainer card. -Pyrenix
To get stars on Pokemon platinum here is what you have to do... get 50 flags underground win 100 battles in a row at the battle tower beat the Pokemon league 10 times
50 flags stolen=platinum(remove all rocks in base) 10 flags stolen=gold(remove 10 rocks in base) 3 flags stolen=silver(remove 5 rocks in base) 1 flag stolen=bronze(remove 1 rock in base)
In Platinum, you have to beat the Elite Four, win a Master Rank Contest, win 100 consecutive battles in the Battle Tower, capture 50 flags in the underground and catch all 493 pokemon.
the same way you take your friends flags
In your underground secret base, right? You'll have to capture at least one flag underground before you can delete them. Just keep capturing your friends flags and eventually you will have much more room for goods in your base.
Hopefully this is all correct but, You have to beat the Elite Four, win a master rank contest, capture 50 flags underground, complete the National Pokedex (all 493 pokemon.), and last but not least get a 100 win streak at the Battle Tower.
You get gems by increasing your flag rank in your secret base in the underground. You rank up when you capture other peoples flags.
I know... I'm answering my own question... However, shortly after asking this question, I was able to get 50+ flags on the Pennant Capture using a Sneasel, Meowth, and a Ledian. The Pennant Capture is easiest to do on the Skill Course because the Pokemon are not as fast. I took 9 flags every 6 seconds and then used the remaining 4 seconds to switch Pokemon. I did this until I had 45 total flags. Then, as time was running out, I quickly snatched 6 more flags using Ledian. To be able to do this requires fast hands and good luck... because I had thought this to be impossible until I finally beat it.
you need to get flags from plauing with your friends underground. the flags will be in there base so if you find it take the flag and run