How Can I Use An Array Created In One Method In Any Other Method Or Class?

Pass it to the next method, ensure the method being passed to has the correct parameters.

Ie

void CreateArray()
{
  int[] intArray = {1,3,2,4,3,5}; //Create the array
  DoStuffWithArray(intArray); // pass intArray to DoStuffWithArray
}

// other method within class
void DoStuffWithArray(int[] array)
{
    print (array[0]); //print first element of the array passed to this method
}