The question is related to Stock Market.?

Price manipulations does happen in low liquidity markets but they are illegal. Also the market would have to be very low liquidity because you can't just choose to pay a higher price then the market. You would first have to buy up all the shares that anyone else is offering for less than 20 Rs before you can buy your friend's shares. Being a low liquidity market also means that there isn't likely anyone to unload the stocks to. If you participated in such a scheme, your friend may make some money but it will be at your expense. You need to find better friends.