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Is my pokemon team good for heart gold about to battle 5th gym and where to catch horsea?
My team in Heart Gold (restarted) is
1. Feraligatr Lv 37
2. Ampharos Lv 34
3. Growlithe Lv 33
4. Togetic Lv 33
Where can i find a horsea this is heart gold not soul silver i don't want to go to whirl Islands
It's funny how the four Pokemon you listed are exactly the Pokemon I have! All you need is a Exeggutor & Crobat and we're the same! 
Chuck is the 5th leader, and specializes in Fighting type.
Lets disect this step by step. First of all, Togetic, will be your first pokemon, as he is a Normal/Flying type. His flying moves will be important.
Now,
Hitmontop: Hitmontop is a pokemon you don't want to get a fist from. So firstly, I'd use a sleep move, like Yawn. Then while he's asleep, use a flying move like Aerial Ace, or even Fly.
Chuck will more than likely restore Hitmontop if in the red, as most Gym leaders do, with their first Pokemon. Use a sleep move again with Togetic and while out, hit with flying and/or psychic moves.
(( In the event of Togetic fainting, use either Ampharos or Growlithe as a 'throw away' Pokemon. Fighting isn't their rise and shine type, so send one of them out while you revive, super-potion or whatever you need to get Togetic on his/her feet. I recommend doing this often. Nominate a throw away pokemon (ie- Against a Grass gym leader, make Feraligatr your throw away, or against a Rock gym leader, make Ampharos your throw away. Just stick them in to take the brunt while you heal the Pokemon that you need. ))
Primeape: Lets face it, it's just a filler. Any huge problems with him, and I'd be worried about my skill. Use similar tactics you used on Hitmontop. However, maybe even change to Feraligatr and use a powerful Ground move to wipe him out.
Hitmonlee and Machoke: I would put both to sleep also. Use Psychic/Flying moves. However, do not let Machoke get a hold of you, he is very strong and can knock you out. Use fly, or use a throw away Pokemon to paralyze, poison him before you get a hold of him with Togetic or Feraligatr.
Hitmonlee might as well be with Primeape and Hitmontop.
Poliwrath: A change of game! (You can you this for when you re-match, and for your first time, which is now.)
Poliwrath is Water and Fighting, but with an up hand of Psychic moves too! Mean. Luckily Togetic isn't particularly weak to ANY of them. However, after getting a nice bruising from Machoke (or Primeape only, if you're just starting) you may want to send out a filler to ease out as much as you can and revive Feraligatr and Togetic. Here, is where Togetic and Feraligatr turn into throw aways in some aspects, especially Feraligatr. Now, your first throw away to send out should be Growlithe. Use him as a brunt to heal Ampharos, who WAS previously a Throw away. Now, throw in Feraligatr or (Less preferably) Togetic and use them to heal Ampharos and sleep Poliwrath respectfully.
Now, toss out your fully healed Ampharos, and use a SPECIAL electric move (Ampharos has higher special attack.) Such as discharge, thunderbolt, or better yet, Thunder. It should wipe out Poliwrath, especially if you use Charge before hand.
Then you're done!
To Improve, I would:
-Get more Pokemon and train them harder. I wouldn't recommend Horsea, I understand you're thinking of Kingdra, but that seriously cancels you out by having too much water, where something you actually need is missing. I highly recommend a pokemon resistant to Electric, like Exeggcute, Aerodactyl; Kabutops or Sandslash.
Then for sixth, maybe a dark type. Houndoom, is a good choice, or Absol. They will help you in the Elite Four.
Then you will have:
(Left= the type) (Right= the Pokemon you have to counter it.)
Water: Ampharos
Fire: Feraligatr
Grass: Growlithe
Electric: Chosen Rock or Ground type.
Ice: Growlithe.
Poison: Chosen Rock, or Ground type.
Ground: Feraligatr
Rock: Feraligatr
Dragon: Feraligatr (Ice move)
Normal: Togetic
Ghost: Togetic
Psychic: Chosen Dark type.
Dark: Chosen Dark type. Or even a fighting move from Ampharos or Togetic, or Chosen Rock/ Ground type.
Bug: Growlithe
Steel: Growlithe, or Ice Move from Feraligatr.
Good Luck!
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