Below is the test case generator for the given problem statement "Chinol Choco":

```python
import random

def generate_coordinates():
    return random.randint(0, 1000), random.randint(0, 1000)

def tcgen():
    n = random.randint(2, 200)  # number of stores
    m = random.randint(1, 15)  # number of factories
    
    store_candidates = []
    for _ in range(n):
        a, b = generate_coordinates()
        c, d = generate_coordinates()
        store_candidates.append((a, b, c, d))
    
    factory_locations = []
    for _ in range(m):
        x, y = generate_coordinates()
        factory_locations.append((x, y))
    
    return n, m, store_candidates, factory_locations

def format_test_case(n, m, store_candidates, factory_locations):
    lines = []
    lines.append(f"{n} {m}")
    for a, b, c, d in store_candidates:
        lines.append(f"{a} {b} {c} {d}")
    for x, y in factory_locations:
        lines.append(f"{x} {y}")
    return "\n".join(lines)

# Example usage:
n, m, store_candidates, factory_locations = tcgen()
test_case = format_test_case(n, m, store_candidates, factory_locations)
print(test_case)
```

This generator creates random test cases for the given problem statement. Here is what each part of the generator does:

- `generate_coordinates()`: Generates a random coordinate within the range [0, 1000].

- `tcgen()`: Generates the entire test case:
  - Randomly selects the number of stores `n` within the range [2, 200].
  - Randomly selects the number of factories `m` within the range [1, 15].
  - Generates `n` pairs of candidate coordinates for the stores.
  - Generates `m` factory coordinates.

- `format_test_case()`: Formats the generated test case into a string suitable for competitive programming input.

You can use the generated test case for testing purposes or to understand the structure of the input. Simply run the provided example usage to generate and print a test case.