Lathspell, those EVs are ugly. 252/128/128 set ups are generally brought on by a lack of understanding about what the stats mean.
Anyway, quick rates:
Salamence: EVs need to be tailored to your IVs. I use max Att, take Speed up to 264, then throw the rest around HP and the defences. (on average I find about 100 EV free for defensive stats). Fire Blast is an option, even with Adamant it can do a number on Forry/Skarm/Scizor.
Alakazam: Modest can be used ingame, since even in-game most things aren't gonna outspeed unless you're facing Timid Sceptile or something. Anyway, looks fine. For once, Lathspell got the EVs right.
Sceptile: Thunderpunch can be an option over Dragon Claw, although you need Emerald to get that move. Otherwise fine.
Metagross: Again, you need to tailor your EVs. I use max Att, set Speed to around 197-198, then throw the rest in the defences. I also tend to put more in Sp Def than Def for Metagross.
Skarmory: Whatcha gonna outspeed ingame? EVs go 252 HP/36 Att/220 Def IMO, although you can have a bit of leeway here. Max HP is necessary though.
Blissey:
[email protected] again. Try 252 HP/252 Def/6 Sp Def. If you can get a Roselia, breed off for Aromatherapy.