No you can't go because you have to use rock climb in the way to spear pillar.Hi I'm Dhruv
If you try to get to 222 before the climax of the game at Spear Pillae, you won't be able to pass. After you defeat Cyrus at Spear Pillar after your 7th gym battle, you will be able to pass.
by BEATING the 7th gym
Yes, beating the 7th Gym does not effect getting the secret potion.
awww by beating the 7th gym
To Blackthorn City.
after beating the 7th gym leader talk to steven in his house in mossdeep
beating the 7th gym leader If you have gone to all the lakes and battled team galactic in veilstone city and freed uxi, azelf and mespirt, you make your way through mt coronet to spear pillar and battle the galactic commanders, and beat/catch girantina in the distortion world,the route to get to sunnyshore will be open.
To make the man let you pass you need to catch Dialga at spear pillar. you will need the hm rockclimb, rocksmash ,and defog.
In Pokemon Diamond, you get Dialga before the 8th gym battle. After you beat the 7th gym, you battle at the peak of Mt. Cornet, Spear Tower, and battle, preferably catch Dialga, then you can access Sunyshore City. In pearl you battle Palkia.
Go to the Radio Tower in Goldenrod City.
beat the 8th gym which is in the next town after the town which you live in
You have to beat the 7th gym like almost all the Pokemon series. You first go to the crater you have to dive to get into and go to the gym in the area. you go to the tower then. Make sure your prepared though.