It's very simple of you want to do Berry crush you need a wireless adapter and another person to do the berry crush and if you want to do any thing wireless in Pokemon emerald then you need a GBA or GBA SP
http://www.psypokes.com/rs/berrystats.php
Mulch
You have to wait for it to grow.
The leichi berry raises the attack stat if held by a Pokemon (that what it says in heartgold but I am not sure if it's the same in emerald)
Pataya berries must be obtained from either Pokemon colosseum or Pokemon xd gale of darkness trade a Pokemon holding the berry to emerald then plant it to get more.
In emerald you get them in the contest hall by making them with berries.
http://www.psypokes.com/rs/berrystats.php
Mulch
You have to wait for it to grow.
The leichi berry raises the attack stat if held by a Pokemon (that what it says in heartgold but I am not sure if it's the same in emerald)
Feed them good pokeblocks from durin berries.
Pataya berries must be obtained from either Pokemon colosseum or Pokemon xd gale of darkness trade a Pokemon holding the berry to emerald then plant it to get more.
No you can water them infinite times and nothing bad will happen.
Lum berries are randomly given out by the berry masters wife.
The berry type that will make beauty go up are all dry berrys.
Tamato berries are randomly given out by the berry master in ruby, sapphire or emerald.
Mix one out of berries. It will be in your pokeblock case. Feed it to the Pokemon that you want to give the pokeblock to.