Nature help needed

[KingBattlus]

I'm working on breeding up some Pokemon in Emerald in anticipation for DP in the coming weeks, and would like to know what natures I should be aiming for on some of my Pokemon.

Venusaur-
Calm? Bold? Modest even?
Sleep Powder
Leech Seed
Energy Ball
Sludge Bomb/HP Fire if Im able

Slowbro-
Bold? Modest? Something else?
Surf
Ice Beam
Flamethrower/Grass Knot/Psychic/Calm Mind/Thunder Wave
Slack Off

Clefable-
Modest? Bold? Anything?
Calm Mind
Thunderbolt
Ice Beam
Softboiled

Feel free to suggest any new tows Clefable has to work with as its movepool is just too big for me

Gengar-
Modest? Timid?
Thunderbolt
Shadow Ball
Hypnosis
Will-o-Wisp? Energy Ball? HP Ice?

Are special sweepers like Gengar and Starmie better off Timid or Modest?
Should Rhyperior be Adamant or Impish?
Magnezone should be... Modest?
Tyrantiar better off Jolly or Adamant?
Mr. Mime, Timid or Calm?
Elemence, Modest or Timid?

Is it better to increase speed or attack on most sweepers since we now have items to increase speed as well as attacks? Particularly with those that will hold Life Orb. Thanks in advance.

 

[White Lotus]

Gengar should be <Timid : +Spd / -Att> especially with only 2 attacks.

Slowbro should be <Bold : +Def / -Att> always. All Bulky Waters should.

I think your *Calm Mind Cleffable should be <Bold : +Def / -Att> but i'm not sure on this one as i've never used him.

Venusaur is OK with either defensive nature. <Bold : +Def / -Att> or <Calm : +Sdf / -Att>

As far as generally speaking I tend to lean (+Spd > +Att) on Sweepers but that's just my preference.

I run all my Gengar / Starmie at <Timid : +Spd / -Att>.

 

[Shiny Kamex]

Yes Venasaur is a defensive pokemon so calm it probably that best for it. Next as White Lotus said all bulky waters must have bold on them.

Gengar should be timid (Speed+ Attack-) or Modest (Attack- sp. Attack+) if you want the sp.attack to go up.

Starmie I think is fast enought to have a modest nature (attack- sp. attack+) because it speed is higher than sp.attack.

Rhyperior I think should be impish because it has a lot of 4* weaknesses but since a lot of them are mostly sp. attack types I suggest only using it against physical types.

Magnezone yes should be modest.

T-tar should be jolly (sp.attack- speed +) because it already has a good attack stat and could use more speed.

Mr. Mime sucks because most ghost and dark attacks are physical and his defense is below average so relaxed (defense+ attack-) is the best choice.

Next I hope you mean Salamence as your last choice and Adament (attack+ sp.attack-) or Jolly (speed+ sp.attack-) is your best choice for this.

 

[Frost Nova]

CBtar is debatable though, it really depends on what you want to outspeed. DDtar likes Adamant over Jolly though.

Choice Band Rhyperior likes Adamant, SD + Substitute Rhyperior prefers Impish so its Substitutes are harder to break. Besides, Swords Dance boosts its attack enough to kill stuff.

Mr. Mime is actually pretty decent: Timid IMO if you're BPing.

Elemence = Special Salamence. Timid would be better since 4th Gen Elemence usually has Choice Specs in the moveset.