the Pokemon salon guy is in goldenrod underground place. you have to battle some trainers to get to him. there's actually salon guys, but only one is seen each day. sometimes it's the older brother, who's better, and sometimes there's the younger, who's still good. these guys make your Pokemon happier.
liquid crystal? do you mean Pokemon crystal if its Pokemon crystal the levels are 19 20 and 23
in the fight area
no
Crystal does not have Mewtwo. Instead it has Ho-oh after you beat the Pokemon league.
Crystal is a GEN:2 game while Latios is a GEN:3 pokemon. (so no)
talk to a guy in viridian city
some guy gives it to you if you give him mail
In Pokemon crystall Bill is the guy who makes the PC system and also likes rare Pokemon
Find the machine part in the cerulean city gym give that to the guy.
get silver wing talk to the guy in pewter and go to seafoam where articuno is
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No, you have to trade an abra from a previous game in order to get TM09
I preference pokemon crystal
you can get a dratini from a guy in dragons den in blackthorn city or you can catch one in the water in dragons den
train an eevee to lvl 40 but: it must be night when it turns lvl 40 You also must talk to the Pokemon salon guys three times.
After you do the team rocket thing the guy gives it to you at the top of the radio tower.
In the city where the sick lighthouse Pokemon was, go to the restaurant beside the Pokemon center and talk to the guy sitting at the table. He's the one who gives your Pokemon strength.