no. you need spinda to come and give you a feather.
1st you must get the clear wing from Spinda . Then after you beat Fiery field and Thunder Field you are given access to Northwind Field
You have to go to fiery field after you get the feather from spinda. On floor 30, you'll meet entei. After you beat him up, he turns the feather spinda gave you into a red feather.
well first you need hm surf from solar cave and go to Pokemon square and a spinda falls and you take him to your team base then he will tell you about the mirage Pokemon and gives you the clear wing and go to great canyon to talk to xatu and you will unlock fiery field easy as pie!
First you need to get SURF from solar cave, then sleep a day and a spinda will be in the town square, you will then take it to your rescue base and it will give you a CLEAR FEATHER. It says you can now ggo to Fiery Field. You beat fiery field (30 floors) then lightning field (30 floors again) then northwind field (30 floors) and you get the rainbow wing and you can go to mt.faraway.
after finishing the main story line and getting the HM surf a spinda will come to town and give you an item called the clear wing and tell to go to the fiery field. the boss is entei. After you beat him you will be able to go to the lightning field. The boss is raikou. hope this helps
you unlock it by getting the HM surf in solar cave 10 or 15 I forgot, then go to town center and try to go to pelipper post office and when you try to go a bellsprout will stop you and then a spinda gives you a feather to take to entei in feiry field 30f
Entei
After seeing spinda and doing feiry field and beating Entei
To get Entei you must complete the game (beat Rayquaza) then go to solar cave, get surf from floor 20, you must have a water or flying type to get over the water. Once you have it the next day go to Pokemon square and a spinda should come and tell you about a mirage Pokemon, you will then gain access to Fiery Field. Fiery Field is a 30 floor dungeon that has Entei as the boss, if you clear the dungeon and buy the friend area Sacred Field you can go back to Fiery Field to try and recruit Entei.
You'll find him on the 30th floor of Fiery Field. You unlock that by beating the story portion and getting the hm "Surf", starting the Spinda side-quest. The four dungeons will have Suicune, Raikou, Entei, and Ho-oh.
In fiery field. I got 3 fire stones from that dungeon, beilveve me. If you don't know the dungeon, you have to complete the game then go into the square, come out, talk to medecham go to the square talk to lumbre, talk to whiscash, head out of the square and go back in, talk to spinda and then go to great canyon, talk to xatu and you gain access to fiery field.(To beat the game, you have to beat rayquazza.)