I have a quick question about my team , should i switch one of them out and put a registeel in for a good bulky tank? Or should i leave it how it is.

Rotom-w
timid
levitate
choice scarf

Hydro pump
volt switch
hidden power- fire
trick

He's basically my lead to scout, if i know the foe is going to set up on me i use trick to keep them in that phase, other moves are self explanatory
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Heracross
adamant
guts
flame orb

Mega horn
close combat
night slash
facade

If the oppent switches when i have rotom use volt switch he gets a free burn and the turn ends. He's my physical sweeper.

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Nidoking
modest
sheer force
life orb

Earth power
thunderbolt
ice beam
sludge bomb

With sheer force moves with a secondary effect are boosted; which acts like a life orb, with a life orb attached it boosts it even more plus the recoil from the orb is removed. He acts like a special sweeper

Ninetails
timid
drought
fire gem

Overheat
energy ball
hidden power -fighting
hypnosis ( might change this to will o whisp)

He's my sun bringer. With moves to tackle ones that get in his path. To help the other team mates he has the status one. If he puts them to sleep i am hoping they will switch which gives me a chance to infect the others. If i go with will o whisp that halves their attack while getting hurting them.

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Charzard
timid
solar power
choice specs

Fire blast
focus blast
solar beam
air slash

With the boost from the sun with the ability, the stab from the sun, and the choice specs he can be deadly in the sun. Another powerful special sweeper.

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Latios
timid
levitate
white herb

Draco meteor
thunderbolt
hidden power -fire
psyshock

With white herb the stats lost from draco metor are restored so he can hit hard once more with a powerful stab move. Since psyshock hits the defense stat it's used fore ones with horrible defense stats while getting a stab boost from his high sp. Attack. If i battle with friends he will get a soul dew.

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Yeah so i'm trying to see if i should replace one for a registeel. Thanks in advance for the help.