Make sure the slot where the game card goes is not dusty, and make sure the game card itself is not dusty and is scratch-free.
If all is well with other games, then you may need to exchange the game for a new one.
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Yes, the Nintendo DS and Nintendo DSi can link together to play Pokemon. Keep in mind that games such as Pokemon Diamond and HeartGold cannot link with Pokemon Black (2) and White (2) for battling and trading.
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
Ya you can! Most d.s game you play on any d.s, but i heard a rumor about dsi only games.