my pokemon are low leveled in fire red
where isthe best place for training

In Vermillion city, in the PokeCenter talk to the girl at the front and you get the VS seeker.

VS seeker is great for EV training (good money for vitamins + EVs)

Use it on trainers.

[ FRLG vs. seeker EVs *special thanks to Jiggy37* ]

<< Route 6 >>
Picnicker Isabelle (final team): Lv. 47 Pidgeotto, Lv. 47 Pidgeotto,
Lv. 50 Pidgeot (total: 7 Speed)

<< Route 11 >>
Engineer Bernie (final team): Lv. 28 Magneton, Lv. 28 Magneton,
Lv. 28 Magneton (total: 6 Special Attack)
Youngster Yasu (final team): Lv. 47 Raticate, Lv. 47 Raticate,
Lv 47 Raticate (total: 6 Speed)

<< Cycling Road >>
Biker Ruben (final team): Lv. 48 Weezing, Lv. 48 Weezing,
Lv. 48 Weezing (total: 6 Defense)
Biker Virgil (only team): Lv. 28 Weezing, Lv. 28 Weezing,
Lv. 28 Koffing (total: 5 Defense)

Cue Ball Isaiah (final team): Lv. 49 Machoke, Lv. 49 Machamp (total: 5 Attack)
Cue Ball Jamal (only team): Lv. 26 Mankey, Lv. 26 Mankey, Lv. 26 Machamp,
Lv. 26 Machop (total: 6 Attack)
Cue Ball Corey (final team): Lv. 49 Primeape, Lv. 49 Machamp (total: 5 Attack)
Biker William (only team): Lv. 25 Koffing, Lv. 25 Koffing, Lv. 25 Koffing,
Lv. 25 Weezing, Lv. 25 Weezing (total: 7 Defense)

<< Route 13 >>
Picnicker Susie (final team): Lv. 52 Pidgeot, Lv. 52 Raichu, Lv. 52 Persian,
Lv. 52 Persian, Lv. 52 Raticate (total: 12 Speed)
Bird Keeper Robert (final team): Lv. 47 Pidgeot, Lv. 47 Pidgeot, Lv. 47 Fearow,
Lv. 47 Fearow (total: 10 Speed)

<< Route 15 >>
Bird Keeper Chester (final team): Lv. 48 Dodrio, Lv. 48 Dodrio, Lv. 48 Dodrio
(total: 6 Attack)
Picnicker Becky (final team): Lv. 54 Raichu, Lv. 54 Raichu (total: 6 Speed)

<< Route 18 >>
Bird Keeper Jacob (final team): Lv. 47 Fearow, Lv. 47 Fearow, Lv. 47 Fearow,
Lv. 47 Fearow (total: 8 Speed)

<< Route 21 >>
Fisherman Ronald: Lv. 28 Seaking, Lv. 28 Goldeen, Lv. 28 Seaking,
Lv. 28 Seaking (total: 7 Attack)

<< Kindle Road >>
Black Belt Hugh (final team): Lv. 55 Machoke, Lv. 55 Machamp (total: 5 Attack)
Black Belt Shea (final team): Lv. 55 Machoke, Lv. 55 Machamp (total: 5 Attack)
Fisherman Tommy: Lv. 33 Goldeen, Lv. 33 Goldeen, Lv. 35 Seaking,
Lv. 35 Seaking, Lv. 35 Seaking (total: 8 Attack)

<< Bond Bridge >>
Tuber Amira (final team): Lv. 47 Poliwhirl, Lv. 47 Poliwhirl, Lv. 47 Poliwhirl
(total: 6 Speed)

<< Sevault Canyon >>
Aroma Lady Miah (only team): Lv. 50 Bellossom, Lv. 50 Bellossom
(total: 6 Special Defense)
PKMN Ranger Nicolas (final team): Lv. 55 Victreebel, Lv. 55 Victreebel
(total: 6 Attack)
PKMN Ranger Madeline (final team): Lv. 55 Vileplume, Lv. 55 Vileplume
(total: 6 Special Attack)