Re: catching entei and suicine
For Entei, you should first use Haunter's mean look on him when you see him. The quickly put him to sleep with Hypnosis or something. Beat Entei untill you are afraid that you'll KO him. Then you should use a Scyther with False Swipe on him. Get him to 1 HP and then trow balls at him. If he wakes up, put him back to sleep.
As for Suicine, you can find him in the right tower of Eructeak City, forgot the name. But you can only enter if you have Clear Bell. To get Clear Bell, free the Radio Tower in Goldenrod from Team Rocket. The director should give you Clear Bell. Then battle the 3? sages in Eructeak's tower and your allowed to see Suicine. Use same strategy as with Entei, except you won't be needing Mean Look.
Near a tree by a river, there's a hole in the ground.
Where an old man of Aran goes around and around